GWD3-Q28

GWD3-Q28:

The coyote is one of several recent ecological success stories:  along with the white-tailed deer, the moose, and other species that are enlarging their natural domains, they have established themselves as supreme adapters in an era when the capability to adjust to the environmental changes wrought by human beings has created a whole new class of dominant large mammals.

A.      they have established themselves as supreme adapters in an era when the capability

B.       they have established themselves as being supreme adapters in an era when being able

C.      it has established itself as a supreme adapter in an era when to be able

D.      it has established itself as being a supreme adapter in an era when its ability

E.       it has established itself as a supreme adapter in an era when the ability

正确答案是E. 但是这道题的结构没看懂。Along with..., the moose and other... 后面怎么会还有主语呢，不管是it还是they？就算有主语，and连接的两个主语，后面的代词也应该是用they啊？