Letter C is the correct answer: Populist Movement.
The origins of the Progressive Movement are found in the Populist Movement. Even though urbanization was the major factor that boosted the Progressive Movement, the Populist Movement greatly influenced progressivism. Reformers highest priority was to remodel the city government in order to root out corruption. Many were the political reforms embraced by the Populist Movement, such as secret ballot, initiative, referendum, and recall.