Read the following conversation and answer the question.

W: You seem very tired recently.

M: It's my new course. My teacher is very strict with me. What's more, there are many assignments every day. I spend most of my time on them.

Question: Why is the man tired? 

- He is too weak to do his homework.

- He is too busy with his studies.

- He spends too much time on ball games.


He is too busy with his studies.