弱弱问道 PP里的语法题

In the mid-1920s the Hawthorne Works of the Western Electric Company was the scene of an intensive series of experiments that would investigate changes in working conditions as to their effects on workers' performance.

(A) that would investigate changes in working conditions as to their effects on workers' performance

(B) investigating the effects that changes in working conditions would have on workers' performance

(C) for investigating what the effects on workers' performance are that changes in working conditions would cause

(D) that investigated changes in working conditions' effects on workers' performance

(E) to investigate what the effects changes in working conditions would have on workers' performance

错选了E    当时就是在investigating 和 to  investigate 之前犹豫了一下  后半个句子没有看 

是不是E句意错了            

个人观点，to investigate带有目的性。一般用sb. do sth. to ....句子讲的是某地发生了什么事。

而题目中的红色的句子是对实验的一个陈述。