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
This is a GMAT Prep question
How to elimante this question
My first go was differences should have between . Even though "is heard " in E is passive I preferred that over A
But it is wrong. Correct answer is A ( My question for A is :help the listener determine should be help the listener to determine Otherwise A looks awkward.
Please explain