填空一题

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Even after safeguards against the _________ of popular sovereignty were included, major figures in the humanistic disciplines remained skeptical about the proposal to extend suffrage to the masses.

A. continuation
B. excesses
C. introduction
D. advantages
E. creation

即使引入了对“主权在民”理论的过度使用的限制，人文科学的主流观点还是对扩大选举权范围的方案持怀疑态度。
句子中safeguard 是限制的意思， 限制的只能是过度的（excess）东西，不会限制introduction