TOEFL Listening: ETS-TOEFL听力机经 - N1FDK5E3K4914073P$

Why does the student mention the number of courses she is taking? A. To explain why she needs to obtain a book right away. B. To explain why she did not visit the bookstore earlier. C. To convince the man to give her a discount. D. To emphasize the number of books she needs.