All of the following are mentioned in paragraph 2 as changes that occurred during the late Pleistocene EXCEPT: A. The Eurasian tundras became more forested as both temperature and rainfall increased. B. The Arctic region became less productive, and much of its fauna and flora began to disappear. C. The southwestern United States became much drier, resulting in a decline in species diversity. D. The North American open steppe tundras became cooler, resulting in a decrease in vegetation.