Answer:
A) the study of hearing
Step-by-step explanation:
The word "audio" means hearing, and you usually see that word in other words that have to do with listening.
examples:
audiobook (books that you listen to)
audiometer (machine to evaluate hearing)
you get the idea.
so if -ology means study, then it is the study of hearing!
lmk if you want me to further evaluate :)