TOEFL Listening: ETS-TOEFL听力机经 - GB4QC128S387REMSP$

Why does the professor say this: A. To invite students to define the word novel B. To give a reason for his belief that it is not possible to determine the first novel in English C. To signal that he is about to define the word novel D. To explain why some critics do not classify Robinson Crusoe as a novel