which可以指代bear么？

蚊子小猴

The army cutworm moth is a critical source of fat for as many as a third of Yellowstone National Park's grizzly bears; they overturn rocks to find them, as many as 40,000 per bear in a single day.

(A) bears; they overturn rocks to find them, as many as

(B) bears; overturning rocks to find the insects, up to

(C) bears, overturning rocks to find them, as many as

(D) bears, and they overturn rocks to find them, up to

(E) bears, which overturn rocks to find the insects, as many as
这道题答案选E，我想问一下，which可以指代有生命的物体么？which不能指代人，可以指代熊么？谢谢各位！

elsachialee

我觉得可以。不然换作who不是更加奇怪。who指人，其它的用which吧。
求不同意见。