推行郡县制有利于巩固秦朝的统一,是因为这一制度( )
A:促进了封建经济的发展
B:提高了政令执行的效率
C:便于加强中央对地方的直接管辖
D:消除了地方割据势力的形成
—Yes. Though it's a little expensive, it really has good quality.