The author of the passage quotes Urban and Sherzer most probably in order to A. introduce a discussion of the legal ramifications of expanding the nation-state concept B. summarize a claim about one possible effect of asserting cultural differences within a state C. shift the focus of discussion from internal threats that states face to external threats that they face D. point out similarities between the threats to states seen by Urban and Sherzer and those seen by Hill E. describe one way an ethnocentric practice has affected attempts to assert cultural differences within a state