问prep pack1 里面的一道语法题，求大牛解释

zsck163

Contemporary cognitive scientists maintain that emotions, which are biological functions, evolved in the nervous system to help animals survive in hostile environments and procreate, and feelings are products of the conscious mind, reflecting the interpretation of emotions.
A. procreate, and feelings are products of the conscious mind, reflecting
B. procreate, and that feelings, as products of the conscious mind, reflecting
C. procreate, and that feelings, which are products of the conscious mind, reflect
D. to procreate, and feelings are products of the conscious mind, which reflect
E. to procreate, and that feelings, which are products of the conscious mind, reflecting
正确答案是C，为什么呢？
为什么不选E？语法达人解释，感激不尽