a joke that is a play on words is a\nriddle.\ncomic.\npun.\nprank.

Brief Explanations:

A pun is a form of word - play that exploits multiple meanings of a word, or of words that sound similar. A riddle is a question or statement intentionally phrased so as to require ingenuity in ascertaining its answer. A comic is related to comedy or a person who performs comedy. A prank is a mischievous act.

Answer:

C. pun.