单项选择题

隋朝得以统一全国的原因有 () 1 长期的分裂割据,人民渴望统一 2 隋为灭陈做了充分准备,战略战术运用得当 3 南方陈政权皇帝昏庸,不问政事 4 隋建立后励精图治,发展生产,经济繁荣

A.①③④
B.①④
C.①③
D.①②③④
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