The Reconstruction Era Came to an End Because

The Reconstruction era came to an end because

A) African Americans had been granted full social, political, and economic equality in the South.
B) northern Republicans agreed to end federal occupation of the South if southern Democrats allowed Rutherford B.Hayes to become president.
C) the Supreme Court ruled that federal troops could not be stationed in southern states.
D) in 1876, state legislatures in the South passed laws forcing the federal government to remove all troops immediately.