Thing we need to keep in mind for these types of questions:
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1\. The correct answer will be the part of the text that's directly restated or demonstrated in the question we're being asked about—without literary interpretation, judgment calls, or outside knowledge from the test-taker.
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2\. The cited text in the correct answer is sometimes sort of a summary of evidence discussed in the paragraph where that citation appears. In other words, you may find that the text immediately before or after the citation repeats or elaborates on the evidence in the citation itself. So don't be put off if some statement of relevant evidence appears just before or after the cited text from the right answer to the "best evidence" question—even though the cited text in the correct answer will provide evidence for the statement in question, there may be some additional relevant evidence that shows up just outside of that cited text.
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3\. Finally, the correct answer to this type of question is typically pretty straightforward—often, only one of the four choices will seem to have any real connection to the statement in the question. But, on the few questions when more than one choice seems plausible at first, we'll always find that only one choice refers to a part of the text that's specifically restated or demonstrated in the correct answer to the relevant question.