TOEFL Listening: ETS-TOEFL听力机经 - 55H39XAPW36P_TJ5P$

Why does the professor say this? A. To indicate that he did not understand the student's answer? B. To imply that the student does not understand the concept of visual analysis? C. To encourage the student to think about information from the assigned readings? D. To suggest that visual analysis and written sources sometimes provide conflicting evidence.