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

答案为E。看得出D有很多不合适的地方，比如主动语态更直接，depth跟in搭配更好。可是E里they和未划线的their明显指代的不是一个东西，又没有分号分成两个句子，这样也可以吗？

赞ls，找出这能么多例子来，很彷徨到底是能不能按照代词指代一致来做题，难道they和their不一致就无所谓？