请教PREP1 70

70.
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It is unclear whether chimpanzees are unique among nonhuman species in their ability to learn behaviors from one another, or if, when other animals are studied in as much depth, similar patterns would be found.

(A) if, when other animals are studied in as much depth, similar patterns would be found

(B) if other animals were studied with as much depth they would exhibit similar patterns

(C) would similar patterns be found in other animals if they were studied in as much depth

(D) whether similar patterns would be exhibited in other animals that were studied with as much depth

(E) whether other animals would exhibit similar patterns if they were studied in as much depth

这道题目的答案是E，但是我觉得没有划线的部分their指代的是chimpanzees，而E选项的they指代的是other animals，不一致啊！请麻烦解释一下吧，谢谢大家。

I have some problem with E. "if they were studied in as much depth."

The sentence omits "as champazees were"

Is this ommission correct?