The answer is letter C. The progressive Era wanted to change
the political outlook as well as create a government that would be beneficial
to the citizens of the United States. They created laws to stop big bosses in
saloons as well as promote women suffrage in the United States
I say C. because the entire paragraph is talking about political power.
Q1) Command of the Army act
Q2) Tenure of office act
Q3) Seven Martyrs
Q4) Fifteenth Amendment