白勇语法平行结构问题

yinshengsss

In recently years cattle breeders have increasingly used crossbreeding, in part that their steers should acquire certain characteristics and partly because crossbreeding is said to provide hybrid vigor.

A in part that their steers should acquire certain characteristics
B in part for the acquisition of certain characteristics in their steers
C partly because of their steers acquiring certain characteristics
D partly because certain characteristics should be acquired by their steers
E partly to acquire certain characteristics in their steers

这道题目选E 我选的D。
不明白为什么E属于平行结构，觉得D也勉强能够算对。
麻烦大家帮帮忙！谢谢！

yinshengsss

没人理啊，自己顶下~~~