Which of these was a method that Republicans used to maintain control of Congress during Reconstruction?

Responses

Acreating the Freedman's Bureau to aid the former slaves
creating the Freedman's Bureau to aid the former slaves
Bexpelling members of the Democratic party from Congress
expelling members of the Democratic party from Congress
Ctaking the right to vote and hold office from former Confederate leaders
taking the right to vote and hold office from former Confederate leaders
Dplacing former Confederate generals on trial for treason against the U.S.

Ctaking the right to vote and hold office from former Confederate leaders