According to paragraphs 2 and 3, all of the following are true of the diversity of large mammals in the North American grasslands after the most recent glaciation EXCEPT: A. It was easily as great as the diversity of large animals in Africa today. B. It diminished significantly over a period of fewer than 1,000 years. C. It was probably reduced by both climate change and hunting at the end of the Pleistocene epoch. D. It was much greater than the diversity of small animal populations during the Pleistocene epoch.