Explanation
In this question and in general, the point of something in
a decently written paragraph is the overall point of the paragraph in which it
is contained. And GMAT passages tend to be decently written. The line mentioned
comes in the last paragraph, which, as we have discussed, achieves two things:
it settles the living-fossil question, and it settles the closest-relative
question. This particular point probably contributes to one or the other.
Indeed, the c-fish DNA was the key piece of evidence that the c-fish is not a
living fossil. So the author discusses it in order to make that point. Let's
look for that in the answer choices. Choice (A) matches our expectation, and
none of the other choices do. Choice (B) describes something that also happens
in the paragraph, but in the prior sentence.
The correct answer is (A).
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