A person who plays the organ (instrument), is called an organist.
B.
Quotation marks are not used in an indirect quote :)
B the other options are opinions, only B is a factual statement that can be backed up with research or evidence
Person who is opposed to, struggles against, or competes with another; opponent; adversary. the adversary of the hero or protagonist of a drama or other literary work: Iago isthe antagonist of Othello.