PREP1-74 句子翻译成中文为何如此别扭

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

这题我选了E , 一直以为D中的they 有指代biological traits 的嫌疑.

我把they 指代the product of natural selection 和 biological traits 都放在句子中试了下，

翻译如下：

古生物学者STEPHAN JAY GOULD 辩解说许多生物特征不是自然选择的产物，而是其它进化发展中的副产品。他认为（自然选择的产物）/（生物特征）提

高了

怎么二者感觉都很别扭？什么是自然选择的产物提高了繁殖和生存？

请NN 指点！！

再顶下

版主，如果THEY 指代的是BIOLOGY TRAITS ,这不是不符合就近指代了吗?

另外还有指代THE SELECTION OF NATURE 之嫌.

OPEN TO DISCUSS