ＧＷＤ３０－４１

Elk now live almost solely in the Rocky Mountains, which would make it seem that elk are mountain dwellers, while they once ranged over virtually all of the continental LACE w:st="on">United StatesLACE> except for a small strip in the extreme Southwest.

1. Elk now live almost solely in the LACE w:st="on">Rocky MountainsLACE>, which would make it seem that elk are mountain dwellers, while
2. The fact that elk now live almost solely in the LACE w:st="on">Rocky MountainsLACE> would make it seem that they are mountain dwellers, but
3. It would seem that elk would be mountain dwellers because of their living now solely almost in the LACE w:st="on">Rocky MountainsLACE>, but still
4. Now living almost solely in the LACE w:st="on">Rocky MountainsLACE>, it would seem that elk were mountain dwellers, although
5. It seems that elk would be mountain dwellers from the fact that they now live solely almost in the Rocky Mountains, since

我选的是Ｂ，但是答案是Ａ，不解？！

A中的which明明是致命错误啊？！

请大家帮忙看看啊？！