求助prep1-74,没有找到

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

why not c,似乎有点颠覆我平行的概念

原文中the products of 是特指，C中simply random by-products是泛指，not .... but 结构不平行。

D选项用but从句来和前面平行。