TOEFL Listening: ETS-TOEFL听力机经 - 9D5CVLT3PD78HH6YP$

What does the professor imply when lie says this: A. The class does not need to talk about what the student just said. B. Geology students sometimes must be willing to work in unpleasant environments. C. He is surprised that the class finds the student's comment amusing. D. He wants to suggest a solution to the problem the student just raised.