TOEFL Reading: ETS-TOEFL阅读机经 - 4AI1T85_3866L6TLL$

It can be inferred from paragraph 1 that one consequence of the unification of Egypt was A. the reduction of the strategic importance of older centers of power B. the opportunity for the recently united Egypt to become economically self-sufficient C. the increase in political tensions between the rulers of Upper and Lower Egypt D. the reduction of Egypt's dependence upon the Nile for trade and communications