求助：GWD-6的一道阅读题

marryecho

     According to a theory advanced
     by researcher Paul Martin, the wave
     of species extinctions that occurred
     Line in North America about 11,000 years
(5) 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 modem Native
     Americans. However, anthropologist
(10) 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
(15) 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
(20) asserting that widespread climatic
     change did indeed occur at the end of
     the Pleistocene. Still, Krech attributes
     secondary if not primary responsibility
     for the extinctions to the Paleoindians,
(25) arguing that humans have produced
     local extinctions elsewhere. But,
     according to historian Richard White,
     even the attribution of secondary
     responsibility may not be supported
(30) by the evidence. White observes that
     Martin's thesis depends on coinciding
     dates for the arrival of humans and the
     decline of large animal species, and
     Krech, though aware that the dates
(35) are controversial, does not challenge
     them; yet recent archaeological
     discoveries are providing evidence
     that the date of human arrival was
     much earlier than 11,000 years ago.
————————————————————————————————————————————————
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

答案是B，但我认为E也正确，因为E提到 Pleistocene extinctions took place much earlier than 11,000 years ago，而原文K的观点是widespread climatic change did indeed occur at the end of the Pleistocene，原文也提到Pleistocene结束于11,000年前，所以根据E选项，Pleistoceneextinctions 早于  climatic change，削弱K的观点。
Gmat新手小白一枚，求前辈指正，不胜感激！