TOEFL Reading: ETS-TOEFL阅读机经 - I81J9V0D1ZD1N585L$

In paragraph 3, why does the author point out that some animals living in southern France migrated to the Arctic when the climate became warmer A. To show that more suitable habitats existed at the time that the megafauna became extinct B. To question the idea that the megafauna were able to migrate to more suitable habitats C. To provide evidence that weakens the climate hypothesis for the megafauna extinctions D. To argue that smaller animals are more successful at adapting to rapid changes in climate