GMAT Sentence Correction (SC) | Re: In human hearing, subtle differences in how the two ears

In human hearing, subtle differencesin 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