请教！

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.

原题是：

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

A. wild animals have less total fat than do livestock fed on grain and more of a kind of fat they think is- no parallelism
B. wild animals have less total fat than livestock fed on grain and more of a kind of fat thought to be- parallelism
C. wild animals have less total fat than that of livestock fed on grain and have more fat of a kind thought to be- no parallelism：动物不能和fat比较
D. total fat of wild animals is less than livestock fed on grain and they have more fat of a kind thought to be- total fat is compared with livestock
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- what does they refer to wild animals or recent studies is not clear...

还是选B

请教“时间造物”

我就是分不清C中的比较对象，为什么C我不能理解为less total fat和that of the livestock 平行？

是不是都是主语平行呢？

谢谢！