Explanation

Creating a filter: we can take our time reading the somewhat lengthy underlined sentence. Assuming we identify no error, we can move on to choice (B).

Finding objective defects: choice (B) distorts the intended meaning. The "consistent to one part in ten thousand" part is not being disputed, as (B) implies; it's just providing information about the subject the imaginary author is discussing. Choice (C) also distorts the point. The "convergent evolution" piece is the point of the sentence, but (C) sticks it at the beginning as if that point were a given. The main point of a sentence should, generally, reside in its independent clause. Choice (C) is out. Choice (D) more or less expresses the intended meaning, but it has a grammatical error; the insertion of the conjunction "but" makes it a non-sentence because it creates a clause that has a verb, "is accounted for," with no grammatical subject. Choice (D) is out. Choice (E) distorts the intended meaning in a way similar to (B). The correct answer is (A).