Mr Carpenter Is Constantly Afraid That He Is Going to Oversleep

Multiple Choice

Mr. Carpenter is constantly afraid that he is going to oversleep and be late for work. As a result, he spends nearly an hour total each night making certain that his alarm clock is correctly set and saying "It's set, it's set, it's set" each of the times he checks it. This repetitive action is what clinical psychologists refer to as a

A) compulsion.
B) delusion.
C) hallucination.
D) obsession.