TOEFL Listening: TPO-TOEFL听力TPO - 323OEKD6O73TY66TR$

What can be inferred about the professor when he says this: A. He doubts that the students have understood his explanation. B. He doesn't think that bricks are an ideal illustration of his point C. He is not sure that the information he has just given is accurate D. He thinks that the similarities between liquid and bricks are surprising