The primary function of the third paragraph is to A. search for evidence to corroborate the basic assumption of he theory of Pan-Indianism B. demonstrate the incorrectness of the theory of Pan-Indianism by pointing out that native American groups themselves disagree with the theory C. explain the origin of the theory of Pan-Indianism by showing how it evolved from other assimilationist theories D. examine several assimilationist theories in order to demonstrate that they rest on a common assumption E. criticize the theory of Pan-Indianism by pointing out that it rests upon an assumption for which there is no supporting evidence