Which one of the following best summarizes the main idea of the passage? A. Despite the fact that sociologists have only recently begun to understand its importance, intertribalism has always been an influential factor in native American culture. B. Native Americans are currently struggling with an identity crisis caused primarily by the two competing forces of tribalism and intertribalism. C. The recent growth of intertribalism is unlikely to eliminate tribalism because the two forces do not oppose one another but instead reinforce distinct elements of native American interact with the broader community around them. D. The tendency toward intertribalism, although prevalent within native American culture, has had a minimal effect on the way native Americans interact with the broader community around them. E. Despite the recent revival of many native American tribal traditions, the recent trend toward intertribalism is likely to erode cultural differences among the various native American tribes.