Prep74

大家看看这个句子怎么选择??

74.   (28503-!-item-!-188;#058&003635)

Paleontologist Stephen Jay Gould has argued that many biological traits are not the products of natural selection, favored
            due to their enhancement of reproduction or survival, but that they are simply random by-products of other evolutionary developments.

(A) due to their enhancement of reproduction or survival, but that they are

(B) due to the reproduction or survival they enhance, but they are

(C) because they enhance reproduction or survival, but

(D) because they enhance reproduction or survival, but are
        

(E) because of enhancing reproduction or survival, but are

这道题目为什么C不能选择呀???

请NN们帮帮忙~~

http://forum.chasedream.com/dispbbs.asp?BoardID=23&replyID=1958420&id=209794&skin=0
            

http://forum.chasedream.com/dispbbs.asp?BoardID=23&replyID=2228180&id=237423&skin=0