TOEFL Listening: TPO-TOEFL听力TPO - OQ2C42TF1N2L_B43R$

What does the professor imply about the lack of water buffalo and hippopotamus fossils in the more recent lakes? A. The level of water in the lakes was not sufficient for these animals. B. The bottoms of the lakes were too sandy for these animals to stand in. C. The location of the lakes made them too difficult of these animals to reach. D. The vegetation near the lakes did not attract these animals.