TOEFL Listening: ETS-TOEFL听力机经 - GK41RSE1DKG350AFP$

Why does the professor mention cave-dwelling bats? A. To point out that certain types of bats are more effective than others at controlling insect populations B. To compare the roost size of different bat species C. To give an example of a species that demonstrates similar behavior to forest-dwelling bats D. To explain why it is important to research a particular behavior of tree-dwelling bats