问一道逻辑

lllmmm

The prairie vole, a small North American grassland rodent, breeds year-round, and a group of voles living together consists primarily of an extended family, often including two or more litters.  Voles commonly live in large groups from late autumn through winter; from spring through early autumn, however, most voles live in far smaller groups.  The seasonal variation in group size can probably be explained by a seasonal variation in mortality among young voles.

Which of the following, if true, provides the strongest support for the explanation offered?

(A) It is in the spring and early summer that prairie vole communities generally contain the highest proportion of young voles.
(B) Prairie vole populations vary dramatically in size from year to year.
(C) The prairie vole subsists primarily on broad-leaved plants that are abundant only in spring.
(D) Winters in the prairie voles' habitat are often harsh, with temperatures that drop well below freezing.
(E) Snakes, a major predator of young prairie voles, are active only from spring through early autumn.

这题真的不懂唉

perain

个人感觉是E.

Snake数量多，所以young voles死的多，所以group size就变小了。

想了好久哇。。。

Stephanie729

我开始也错了，现在想明白了原来是开始理解错误
from late autumn through winterlive in large groups ;
from spring through early autumn live in far smaller groups.  
这里的小group不是因为大的group分成了小的group，而是因为大的group变小了，为森马大的group变小了呢，感谢楼上正解，因为snake吃他们嘛