Q:Read the following conversation and answer the question. W: Come to the movies with us. Everybody needs to take a break every once in a while. M: I guess I might as well. I've been studying so long I just can't concentrate. Question: Why can't the man concentrate on his study? - He keeps thinking of going to the movies. - His classmates are taking a break. - He's been studying for too long.
A:
He's been studying for too long.