(A) that suggests that the elephant is descended from an aquatic animal, and its trunk originally evolving
Parallelism issue: “evolving” is not the proper verb form to be used here. Plus, there is no need for a comma before the conjunction “and” in this option.
(B) that has suggested the elephant descended from an aquatic animal, its trunk originally evolving
We can eliminate this based on Parallelism as well.
(C) suggesting that the elephant had descended from an aquatic animal with its trunk originally evolved
The use of “had descended” is incorrect in this option. There is also a modifier issue with “with its trunk…” incorrectly modifying “animal”. Thus eliminated.
(D) to suggest that the elephant had descended from an aquatic animal and its trunk originally evolved
Same as above in the case of past perfect tense error.
(E) to suggest that the elephant is descended from an aquatic animal and that its trunk originally evolved
Correct answer.
Hope this clears things up!
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Crackverbal Prep Team
www.crackverbal.com