OG 16 SC-111 一个小问题求助

111. 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 is good 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

(B) wild animals have less total fat than livestock fed on grain and more of a

kind of fat thought to be

(C) wild animals have less total fat than that of livestock fed on grain and

have more fat of a kind thought to be

(D) total fat of wild animals is less than livestock fed on grain and they have

more fat of a kind thought to be

(E) total fat is less in wild animals than that of livestock fed on grain and

more of their fat is of a kind they think is

答案是B选项，我想问的是B选项and后面不是没有谓语动词吗？我的理解是more of a kind of fat是主语，thought算是过去分词，如果硬要说是think的过去时态也说不通啊，因为fat不可能自己think它本身is good for cardiac health的。不知道大家对这个点是怎么理解的