请教PREP 140

140.       (32308-!-item-!-188;#058&006094)

In human hearing, subtle differences in how the two ears hear a given sound help the listener determine the qualities of that sound.

(A) in how the two ears hear a given sound help the listener determine

(B) in the two ears hearing a given sound help the listener in determining

(C) in how a sound is heard by the two ears helps the listener determine

(D) between how the two ears hear a given sound helps the listener in determining

(E) between how a sound is heard by the two ears help the listener in determining

这道题目的答案是A，可是我觉得A选项的介词in后面接了一个完整的句子，但是我学过得知识点说介词后面不能加句子的，为什么啊？谢谢大家。