The part of the ear where sound wave compressions and rarefactions cause the eardrum to vibrate is the

Ainner ear.
Bmiddle ear.
Couter ear.
Dauditory nerve.

Verified Answer :

The question is asking essentially about the location of the eardrum: if it asks where it is that eardrum vibrates, then it is also asking where there eardrum is located: and this is is in the middle ear: answer b.