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

这题答案是B,也有同学认为是C

这题答案是B,也有同学认为是C

B livestock缺少do,  C wild animals have ..和that of livestock不对称

B livestock缺少do,  C wild animals have ..和that of livestock不对称

是否早在这种情况下,首先应该排除不对称的选项?

是否早在这种情况下,首先应该排除不对称的选项?

一个是that of ...不对称

还有一个是简洁原则吧....第2个have可以被省略了

赞同选B，自己的想法：C有一个问题是That的指代，要么指代前面的fat，要么没有指代。无指代的情况肯定错。如果指代fat，那么句子的意思变成：
  wild animals 体内含的总fat比其体内的某一种fat（fat of livestock fed on grain ）要少，illogical。所以C错。

open to discuss.....

同问，C中对比不一致的错误太明显了。虽然我这里的答案是C

B的问题也很明显1、缺少do，会有歧义，2、后半部分不能省略have，否则会造成wild

animal和livestock、more of a kind of fat一起比较之嫌。可以说整个句子充满歧义。

这种情况下选最优答案，依据什么准则呢？