请问这题IT指代什么？

qiongle

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 United States except for a small strip in the extreme Southwest.

• AElk now live almost solely in the Rocky Mountains, which would make it seem that elk are mountain dwellers, while
• BThe fact that elk now live almost solely in the Rocky Mountains would make it seem that they are mountain dwellers, but
• CIt would seem that elk would be mountain dwellers because of their living now solely almost in the Rocky Mountains, but still
• DNow living almost solely in the Rocky Mountains, it would seem that elk were mountain dwellers, although
• EIt seems that elk would be mountain dwellers from the fact that they now live solely almost in the Rocky Mountains, since
  

B中的IT不会是指代the fact吧？语义通吗？

qiongle

自己顶一下，求解答

qiongle

自己顶一下，求解答

nyndw

it指代that后的they are mountain dwellers

W...

根据Manhattan Prep论坛里的回答，这个it不代表任何东西。
例：It is a sunny day.
和例句里的it一样，它不指代任何东西。