代词it/they是否优先指代主句主语？

betowin

According to recent studies comparing the nutritional value of meat from wild animals and meat from domesticated animals,
wild animals have less total fat than do livestock fed on grain and more of a kind of fat they think isgood for cardiac health.
A wild animals have less total fat than do livestock fed on grain and more of a kind of fat they think is
问下大家，这题中的A项我看他人的解释都是说they指代不明 可是代词不是优先指代主句的主语吗？本题中主句主语是wild animals，由they指代，没有任何错误呀？

ritsusong

发出think动作的应该是研究study的人吧，但是前面没有出现这样的名词。

一抹斜阳

wild animals 还能 think 呢？