What Was NOT a Factor in Helping to Bring About

What was NOT a factor in helping to bring about an end to Reconstruction?

A) The Supreme Court asserted that most rights of citizens are under the control of state governments rather than the federal government.
B) An economic depression drew northern attention away from issues in the South.
C) Racism in the North increased, leading some to see blacks as unfit to lead.
D) The Redeemers used the Ku Klux Klan and violence to regain control of state governments.
E) Northern politicians grew tired of hearing about perceived corruption in the South.