Answer:
you are right with your answer
Explanation:
c is right
I don't see any following options to answer your questions.
Answer:dependent
Explanation: because but is a fanboy if u don't know what that is u can look it up sorry if this doesn't help
The answers to this are A and B.
An abstract noun is a noun that you can't feel, hear, taste, smell, and see. Like hope. A concrete noun is a noun that you CAN feel, hear, taste, smell, and see.
So the abstract noun in this sentence is not choir, but harmony.
hope it helps!