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Answer:
I think it's a compound sentence since it contains a comma.
C
because relative clauses start with who, that, which, whose, where, when.
I'm fairly certain that it's an abstract noun. My apologies if that is not correct.
I don't know the context, but I believe the answer must be predicate adjective. If your sentence goes something like "This song is popular", popular is a predicate adjective because it goes together with a linking verb ("is"), and modifies the subject ("song"), telling us what the subject is, and not what it does.