仔细看了一下原句 asserting that widespread climatic change did indeed occur at the end of the Pleistocene. 句中用了 did indeed occur 表示强调。就可以推断,M的观点是没有发生climate change。
C. Additional evidence indicating that widespread climatic change occurred not only at the end of the Pleistocene era but also in previous and subsequent eras-
先看下各自观点: M的观点:人是造成灭绝的主要原因,天气不是原因(从Krech also contradicts Martin’s exclusion of climatic change可以看出) K的观点:人不是造成灭绝的主要原因,天气变化是主因,人是次要原因(从Still, Krech attributes secondary if not primary responsibility for the extinctions to the Paleoindians, arguing that humans have produced local extinctions elsewhere.可以看出)
选项C:climatic change occurred not only at the end of the Pleistocene era but also in previous and subsequent eras说明climatic change不是灭绝发生的原因,削弱了K的观点。
选项B:Paleoindians made use of the small animals, plants, and insects that became extinct说明人是一个原因,但是由于没有说明人是不是主要的原因,因此不能削弱K的观点。