【单选题】The passage supplies information for answering which of the following questions
A．What do historiographers consider to be the precise difference between a nation and a nation-state
B．What concepts in the field of historiography are considered unambiguous
C．Are tribal areas without national spatial markers ever represented as nations
D．What is an example of a nation represented in supra-national units
E．(E) How does the establishment of national spatial boundaries produce political problems
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