It is B. A put option involves a transfer of cash BACK TO the party that is "putting" in exchange for its giving up the instrument. In contrast, a "call" (such as a stock option) involves a transfer of cash FROM the party that is "calling" in order to receive an instrument (such as stock).
PUT = "I don't like this instrument anymore, please take it back and give me back my cash."
CALL = "I would really like to own that instrument. I am exercising my right to buy it, here is my cash."
I find calls easier to remember than puts, so I just think "what is the opposite of a call?"
I think , B is correct.