请问GWD6-Q6（一道weaken题，不是很明白……）

GWD6-Q6：

Which of the following, if true, would most weaken Krech’s objections to Martin’s theory?

A.      Further studies showing that the climatic change that occurred at the end of the Pleistocene era was even more severe and widespread than was previously believed

B.       New discoveries indicating that Paleoindians made use of the small animals, plants, and insects that became extinct

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

D.      Researchers’ discoveries that many more species became extinct in North America at the end of the Pleistocene era than was previously believed

E.       New discoveries establishing that both the arrival of humans in North America and the wave of Pleistocene extinctions took place much earlier than 11,000 years ago

相关的原文如下

According to a theory advanced by researcher Paul Martin, the wave of species extinctions that occurred in North America about 11,000 years ago, at the end of the Pleistocene era, can be directly attributed to the arrival of humans, i.e., the Paleoindians, who were ancestors of modern Native Americans.  However, anthropologist Shepard Krech points out that large animal species vanished even in areas where there is no evidence to demonstrate that Paleoindians hunted them. Nor were extinctions confined to large animals:  small animals, plants, and insects disappeared, presumably not all through human consumption.  Krech also contradicts Martin’s exclusion of climatic change as an explanation by asserting that widespread climatic change did indeed occur at the end of the Pleistocene. 

答案是B。请问C为什么不对？ 我看了RC的中英文解释版，里面说C是加强。。不是很明白……

C说有很多次climatic change，而只有end of the Pleistocene的时候才发生物种灭绝……这样climatic change就不是一个影响物种灭绝的因素了。所以我感觉C也是削弱……

不知哪里思路出了问题。请NN指点。 谢谢：）

However, anthropologist Shepard Krech points out that large animal species vanished even in areas where there is no evidence to demonstrate that Paleoindians hunted them。所以就选个evidenceweaken Krech’s objections

 Krech also contradicts Martin’s exclusion of climatic change as an explanation by asserting that widespread climatic change did indeed occur at the end of the Pleistocene.  所以C就是加强这句话

谢谢楼上的回答 ……可是我还是不明白，为什么C能加强这句话……

Martin把climatic change的因素排除了。Krech反驳M说widespread climatic change did indeed occur at the end of the Pleistocene，所以认为climatic change是导致 the wave of species extinctions occurred at the end of the Pleistocene era。

但是选项C说的是在Pleistocene末期前后都发生过widespread climatic change。如果说climatic change会导致物种灭绝，为什么之前发生过的climatic change没导致物种灭绝，只有发生在Pleistoncene末期的那次climatic change才导致物种灭绝呢。。。？还是觉得C是削弱Krech的解释…

麻烦再帮忙看看，能说得详细一点吗~？谢谢     哎，我跟GMAC的思路总是不一样……

楼上的解答让我豁然开朗…… 哈哈  开心~~

选项B的正确之处也确实是因为weaken了not through human consumption这一部分~~

恩恩~明白啦~ 万分感谢 ~~