Which one of the following most accurately describes the author's attitude towards the theory of Pan-Indianism? A. critical of its tendency to attribute political motives to cultural practices B. discomfort at its negative characterization of cultural borrowing by native Americans C. hopeful about its chance for preserving tribal culture D. offended by its claim that assimilation is a desirable consequence of cultural contact E. skeptical that it is a complete explanation of recent changes in native American society