What Event Marked the Failure and End of Reconstruction in the South

What event marked the failure and end of Reconstruction in the South?

A) Grant refused to intervene in the violence resulting from the Mississippi Plan, signaling a change in northern thinking.
B) Southern Democrats regained control of Congress.
C) The Compromise of 1877 brought moderate Republican Rutherford B. Hayes to the White House where he promptly withdrew federal troops from the South.
D) The election of Democrat Samuel B. Tilden as president of the United States.
E) Republicans in Congress proposed that attempts at Reconstruction be suspended for a time, all concurred, and it never started up again.