Explanation
In this question, and as we have seen in other questions,
the phrase "would be most likely to agree" sounds like mind-reading. In fact,
we want to find a statement that is supported by the passage, and preferably a
statement that must be true on the
basis of the passage. If the author would have to believe a given statement in
order to be consistent with what's stated in the passage, that statement is
objectively the best answer choice. Which answer choice must the author agree
with? Choices (B), (C), and (E) are all out, because they express opinions too
strong to be drawn from the passage. Meanwhile, (A) and (D) are mutually
exclusive, hinting that one must be wrong and one must be right. Is using ice cores
the only way to collect climate data? No; we have direct measurements going
back 150 years (and maybe other methods).
The correct answer is (D).
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