LM
In human hearing, subtle differences
in how the two ears hear a given sound help the listener determine the qualities of that sound.
A.
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
Here is what I think
this one is kinda tricky because the idiom for differences is both "in , between"
A is wrong determine should determines because it is referring to the listener so it should be singular.
B is correct help is in agreement with Differences in terms of number and also Determining.
C is wrong because the idiom for help is help in. So "in" is needed and it's passive so it's awkward here
D is wrong because helps should be help
E the same for C (passive)
here I say passive is awkward because THE TWO EARS is important for the meaning and it should in direct form, we only use passive to undermine the importance of the given subject. I hope I am clear.