Explanation
Creating a filter: in the original sentence, the two
instances of the pronoun "it" jump out as worthy of suspicion. The second "it"
has no reference, and the first is ambiguous between "investment" and "theory."
We can eliminate (A) on these grounds.
Applying the filter: choice (B) solves the problem in (A),
but the wording in (B) indicates that the scientist makes gaps likely;
that's contrary to the intended meaning, so (B) is out. Choice (C) has a
problem with its second pronoun "it"; it's ambiguous. Choice (C) is out. Choice
(D) has broken parallelism between "overlook" and "justifying." So (D) is out,
and we are down to (E). Choice (E) looks good. There is no ambiguity of
pronoun, and the intended meaning is clear: the investment can make scientists
overlook gaps. The correct answer is (E).
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