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【单选题】
很多考古学家曾有这样的观点，在不到2万年以前，人类通过一个进入北美大陆到达美国。但是最近在南美发现的测定时间为3.2万年以前的人类遗址，使研究者们猜想人类是先坐船横穿太平洋到达南美洲，然后向北扩展。 以下哪项，如果被发现，将成为反对以上猜想的恰当证据?A.
匹兹堡附近一个石头做的遗址发现有被1.9的人类使用过的证据。
B.
一些北美的人类遗址比任何在南美发现的遗址时间要早。
C.
这个有3.2万年历史的南美遗址比发现的最古老的北美遗址所在地的气候更加温暖。
D.
南美的遗址在3.2万年以前有人居住后，一直有人居住，直到6 000年前。
E.
上一个，在1.15万年到2万年以前，使世界海平面大大下降了。
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