Why I Don't Believe in Motivation

Directions : Given below are some idioms/phrases followed by four alternative meanings to each. Choose the response (a), (b), (c) or (d) which is the most appropriate expression. underline ("I don't buy it.") (a) I don't believe it (b) I have no money (c) I summarize it (d) I don't need it

Fill in the blank with suitable word I don't believe ..... you say.