问一道题，谢啦

yandawei8568

145. (32475-!-item-!-188;#058&007134)

The Kwakiutl recognized one social unit larger than the tribe--the confederacy, which was a cluster

of loosely knit, informally related neighboring tribes who interacted with themselves more often than

between other tribes.

(A) tribes who interacted with themselves more often than between

(B) tribes who interacted among each other more often than among

(C) tribes who interacted with one another more often than with

(D) tribes, interacting among each other more often than between

(E) tribes, interacting among one another more often than with

红色是划线的，正确答案是C，可是，不是说WHO只能指代人吗？求NN解答