TOEFL Listening: ETS-TOEFL听力机经 - 5BL183S43P343YY7P$

What is the professor's opinion of the Milankovitch theory? A. It is quite convincing but needs to take into account some additional factors. B. It is outdated and needs to be reexamined. C. It accurately predicts the onset of ice ages but not the retreat of ice ages. D. It is no more credible than other theories about the causes of ice ages.