Command of Evidence: Practice Questions & Study Guide
Evaluating whether textual or quantitative evidence—including data from tables and graphs—supports, weakens, or is irrelevant to a specific claim.
Understanding Command of Evidence
Command of Evidence questions test two related but distinct skills: textual evidence evaluation (identifying which quote from a passage best supports a specific conclusion) and quantitative evidence evaluation (identifying which piece of data from a table or graph supports or weakens a hypothesis). Both types require you to analyze the logical relationship between a specific piece of information and a specific claim—not whether the information is interesting or related to the topic, but whether it logically connects to the precise claim being evaluated.
For textual evidence questions, the structure is usually: the question provides a student's claim about a passage, and asks which quotation from the passage most effectively supports that claim. The key error students make is selecting a quote that discusses the same topic as the claim but does not actually provide evidence for it. For example, if the claim is that 'the author believes renewable energy adoption has been slower than expected,' a quote stating 'renewable energy investments have risen dramatically' does not support the claim—it actually tensions with it.
Quantitative evidence questions present a table, graph, or chart alongside a passage that includes a hypothesis or conclusion. The question asks which finding from the data display supports, challenges, or completes a claim in the passage. To answer these correctly, you must: (1) understand what the data display measures, (2) restate the specific claim being evaluated, and (3) identify which row, column, or data point in the display directly addresses that claim. Students who read the data display loosely—noting a general trend rather than the specific relevant comparison—consistently select plausible-but-wrong answers.
A powerful principle for all Command of Evidence questions: the evidence must address the same variable or outcome as the claim. If the claim is about test scores and the data shows attendance rates, the data is not relevant evidence for that claim regardless of how the numbers trend. This principle of claim-evidence alignment eliminates many distractors quickly.
Key Rules & Formulas
Memorize these rules — they come up directly in practice questions.
Evidence must directly address the specific variable or outcome in the claim—topic adjacency is not sufficient.
A claim about employee retention cannot be supported by data about employee satisfaction unless the study explicitly links the two.
For textual evidence questions, the supporting quote must provide a logical basis for the claim, not just discuss the same topic.
If the claim is 'the author is skeptical of the new technology,' a quote describing the technology's features does not support that claim—a quote expressing doubt or identifying limitations does.
For data evidence questions, identify the exact row and column comparison that corresponds to the claim before selecting an answer.
If the claim is 'plant-based diets reduce cardiovascular risk more than pescatarian diets,' look for a direct comparison between plant-based and pescatarian outcomes in the table.
Evidence that weakens a claim is logically opposite: it shows the opposite trend, reveals an exception, or undermines the causal connection the claim asserts.
A claim that 'tutoring improves test scores' is weakened by data showing that tutored and untutored students had equivalent score gains.
Irrelevant evidence neither strengthens nor weakens a claim because it measures a different variable or population.
A claim about elementary school students' reading performance is not addressed by data measuring high school students' performance, even in the same subject.
Command of Evidence Practice Questions
Select an answer and click Check Answer to reveal the full explanation. Questions go from easiest to hardest.
A student is writing a paper arguing that urban tree canopy reduces summer heat in cities. The student wants to include a quotation from the following passage to support this argument. The following text is adapted from a 2020 environmental science report. Urban forests provide a range of ecosystem services beyond aesthetic value. Trees reduce stormwater runoff by intercepting rainfall. Their root systems improve soil permeability and reduce erosion. In summer, evapotranspiration from tree canopies can lower ambient air temperatures in urban areas by 2–5°C compared to areas without tree cover. Street trees also reduce building energy consumption by shading walls and windows, lowering air conditioning demand by an estimated 10–15% in heavily canopied blocks. Which quotation from the passage would best support the student's argument?
Show explanation
Correct answer: C. Evapotranspiration from tree canopies can lower ambient air temperatures in urban areas by 2–5°C compared to areas without tree cover.
Explanation
The student's argument is specifically that urban tree canopy reduces summer heat. Choice C directly supports this by citing the mechanism (evapotranspiration) and quantifying the temperature reduction (2–5°C). Choice A concerns stormwater runoff—a different ecosystem service, not heat reduction. Choice B concerns erosion control—also unrelated to heat. Choice D is a general claim about ecosystem services but provides no specific evidence about heat reduction.
The following text is adapted from a 2022 psychology study summary. A research team investigated whether background music affects reading comprehension. Participants read standardized passages under three conditions: silence, instrumental music, and music with lyrics. Comprehension scores (out of 100) were as follows: | Condition | Mean score | |-------------------|------------| | Silence | 84 | | Instrumental music| 81 | | Music with lyrics | 71 | The researchers concluded that music with lyrics impairs reading comprehension more than instrumental music does. Which finding from the table best supports the researchers' conclusion?
Show explanation
Correct answer: C. Participants in the music with lyrics condition scored lower than participants in the instrumental music condition.
Explanation
The researchers' conclusion is specifically that music with lyrics impairs comprehension more than instrumental music. The direct supporting comparison is between these two music conditions: lyrics (71) vs. instrumental (81). Choice C correctly identifies this as the supporting finding. Choice A compares silence to a baseline but does not address the relative impairment between the two music conditions. Choice B compares lyrics to silence (a 13-point gap), which supports that lyrics impair comprehension, but doesn't specifically show it impairs more than instrumental music. Choice D incorrectly characterizes the instrumental finding—it showed a 3-point decrease, which may or may not be 'significant,' but more importantly it doesn't address the comparison the conclusion is about.
A researcher claims that students who study with spaced repetition perform better on long-term retention tests than students who use massed practice (studying the same material in a single long session). The following table shows data from a 2021 educational psychology experiment. Students studied vocabulary using either massed practice or spaced repetition. They were then tested immediately after studying and one week later. | Study method | Immediate test score | One-week test score | |-------------------|----------------------|---------------------| | Massed practice | 88 | 52 | | Spaced repetition | 78 | 74 | Which choice best describes data from the table that support the researcher's claim?
Show explanation
Correct answer: B. Spaced repetition produced a higher one-week test score (74) than massed practice (52).
Explanation
The researcher's claim is specifically about long-term retention. The one-week test is the measure of long-term retention. The relevant comparison is spaced repetition's one-week score (74) vs. massed practice's one-week score (52)—spaced repetition was 22 points higher. Choice B states this comparison directly and supports the claim. Choice A shows massed practice outperforming spaced repetition on the immediate test—the opposite of supporting the claim, and for the wrong test. Choice C describes the decline in massed practice scores but doesn't compare the two methods. Choice D highlights spaced repetition's lower immediate score—also opposite to supporting the long-term retention claim.
The following text is adapted from a 2023 essay on workplace wellbeing. Studies on workplace wellbeing consistently find that employees with high autonomy—the ability to determine how, when, and where they work—report greater job satisfaction than those in highly controlled environments. However, a researcher argues that high autonomy without sufficient support structures leads to increased employee burnout, not lower burnout, because employees without clear guidance must expend significant cognitive resources on coordination and decision-making. A student wants to identify the quotation from the passage that best explains why high autonomy might increase burnout even among satisfied employees. Which of the following provides the best evidence?
Show explanation
Correct answer: C. Employees without clear guidance must expend significant cognitive resources on coordination and decision-making.
Explanation
The question asks for evidence that explains the mechanism—why high autonomy might increase burnout even when satisfaction is high. Choice C provides the explanatory mechanism: employees without guidance must 'expend significant cognitive resources on coordination and decision-making,' which is a direct explanation for how autonomy can be draining even when it is valued. Choice B states the conclusion (autonomy without support → burnout) but does not explain the mechanism. Choice A describes the satisfaction finding and doesn't address burnout. Choice D is a general statement about autonomy and satisfaction with no mechanistic detail.
A marine biologist hypothesizes that coral bleaching is more severe in shallow water reefs than in deeper water reefs during the same heat stress event, because shallow reefs are exposed to higher temperatures and more intense ultraviolet radiation. The following table shows data from a 2022 reef survey conducted during a regional heat stress event. | Reef depth | Mean water temp (°C) | % colonies bleached | |--------------|----------------------|---------------------| | 0–5 m | 31.2 | 78% | | 5–15 m | 29.8 | 47% | | 15–30 m | 28.1 | 22% | Which finding from the table, if true, would most directly support the biologist's hypothesis?
Show explanation
Correct answer: A. The percentage of bleached colonies decreases as reef depth increases.
Explanation
The biologist's hypothesis is that bleaching is more severe in shallow reefs than deep reefs. The finding that most directly supports this is the trend across all three depth bands: as depth increases (from 0–5 m to 5–15 m to 15–30 m), the percentage of bleached colonies decreases (78% → 47% → 22%). Choice A captures this trend directly and fully. Choice B states the temperature at the shallowest depth but does not by itself show the depth-bleaching relationship. Choice C gives only the deep-reef figure without the comparative context. Choice D describes the difference between two middle-range bands but doesn't capture the full trend or the critical comparison between shallow and deep.
The following text is adapted from a 2021 sociology paper on social mobility. Sociologists studying intergenerational economic mobility have found that the zip code in which a child is raised is among the strongest predictors of their adult income—stronger than their parents' income alone. This has led some researchers to conclude that neighborhood effects (the economic, social, and physical characteristics of the neighborhood itself) are the primary driver of inequality in life outcomes. Other researchers argue that the zip code correlation is largely explained by selective sorting: families with more economic resources choose wealthier neighborhoods, so the zip code correlation reflects parental income effects rather than neighborhood effects per se. A student claims that neighborhood characteristics independently affect children's outcomes, separate from parental income. Which quotation from the passage would best support this claim?
Show explanation
Correct answer: A. The zip code in which a child is raised is among the strongest predictors of their adult income—stronger than their parents' income alone.
Explanation
The student's claim is that neighborhood characteristics independently affect outcomes. The most direct textual support is the finding that zip code predicts adult income more strongly than parental income alone. If parental income alone fully explained outcomes, zip code would not add predictive power beyond parental income—but the passage says it does. This implies neighborhood factors contribute independently. Choice A contains this key finding ('stronger than their parents' income alone'). Choice B is a researcher's interpretive conclusion, not a direct data finding that serves as evidence. Choice C describes the sorting hypothesis (the alternative explanation), which actually weakens the student's claim. Choice D is a weaker restatement of Choice A without the key comparative qualifier.
The following table shows the results of a 2022 survey asking 1,000 adults which news sources they considered most credible. | News source type | % rating "very credible" | |----------------------|--------------------------| | National newspapers | 54% | | Local television | 49% | | Online news sites | 31% | | Social media | 12% | A journalist argues that traditional media outlets are significantly more trusted than digital-native news sources. Which finding from the table best supports this argument?
Show explanation
Correct answer: D. National newspapers (54%) and local television (49%) both received higher credibility ratings than online news sites (31%) and social media (12%).
Explanation
The journalist's argument is specifically that traditional media (newspapers, local TV) are significantly more trusted than digital-native sources (online news sites, social media). Choice D directly addresses both sides of this comparison—it states that both traditional media types outperform both digital-native types, covering all four categories mentioned. Choice A only mentions local TV without making a comparative claim. Choice B only mentions social media's low rating without comparing it to traditional sources. Choice C is accurate but slightly harder to parse—combining categories—whereas Choice D makes the clearest direct comparison between all four source types.
The following text is adapted from a 2023 agricultural science article. Researchers investigated whether cover crops—planted between main crop seasons—reduce soil erosion and improve soil carbon levels. One team argued that the benefits of cover crops are largely offset by the nitrogen they consume, which can reduce yields in subsequent main crops. A second team argued that cover crops improve soil structure and water retention sufficiently to more than compensate for any nitrogen competition. Both teams noted that effects varied significantly across soil types and climates. A student wants to support the claim that cover crops provide net soil benefits despite the nitrogen issue. Which of the following pieces of textual evidence from the passage best supports this claim?
Show explanation
Correct answer: C. Cover crops improve soil structure and water retention sufficiently to more than compensate for any nitrogen competition.
Explanation
The student wants to support the claim that cover crops provide net benefits despite nitrogen competition. Choice C directly addresses this: it says the soil structure and water retention improvements are sufficient to 'more than compensate' for nitrogen competition—precisely the argument that benefits outweigh the nitrogen cost. Choice A describes variability across contexts, which does not support a net-benefit claim. Choice B states the benefits (erosion reduction, carbon improvement) but does not address whether these outweigh the nitrogen issue. Choice D is the opposing argument—that benefits are offset by nitrogen costs—which weakens rather than supports the claim.
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Common Mistakes to Avoid
These are the most frequent errors students make on Command of Evidence questions. Knowing them in advance prevents costly point losses.
- !Selecting a textual quote that discusses the same topic as the claim but does not provide logical support for the specific assertion being made.
- !Reading a data table selectively—noticing a large or striking number without checking whether it corresponds to the specific comparison the claim requires.
- !Confusing 'this evidence is consistent with the claim' (which is not enough) with 'this evidence directly supports the claim' (which requires a tighter logical connection).
- !Selecting evidence that supports a related but different claim—for example, evidence for 'X causes Y' when the claim is 'X correlates with Y.'
- !Misreading the direction of a quantitative comparison (e.g., reading a table's rows as columns) and selecting evidence with the wrong trend.
Strategy Tips: Command of Evidence
Before reading the answer choices for a quantitative evidence question, describe in words what the table or graph is showing—what do the rows, columns, and axes represent? This prevents misreadings under time pressure.
For textual evidence questions, re-read the specific claim in the question stem carefully and identify the key assertion—then match each quote to that specific assertion, not to the passage's general topic.
Practice the 'so what' test: for each piece of candidate evidence, ask 'so what does this tell us about the specific claim?' If you cannot draw a direct logical line, the evidence is probably a distractor.
When two answer choices both seem like plausible evidence, ask which one more directly and specifically addresses the claim's exact phrasing—the more targeted answer is usually correct.
Other Information and Ideas Subtopics
Central Ideas and Details
Identifying the main argument or central claim of a passage and understanding how specific details support or relate to that claim.
Inferences
Drawing conclusions that are strongly and directly supported by a passage's stated information, without going beyond what the text implies.
Master Command of Evidence
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