TOEFL Listening: TPO-TOEFL听力TPO - 6U17BO717350966OR$

Why does the man hesitate before agreeing to the professor's request? A. He is not sure his effort would be successful. B. He feels overwhelmed by all his schoolwork C. He is unclear about what the professor wants his to do. D. He does not like to work on more than one assignment at a time.