题目选项分析

The Kwakiutl recognized one social unit larger than the tribe--the confederacy, which was a cluster of loosely knit, informally related neighboring tribes, interacting among each other more often than between other tribes.

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 one another more often than with other tribes.