What was the role of Ulysses S. Grant in ending Reconstruction?

Responses
A He signed Executive Order 9066 which officially ended Reconstruction.He signed Executive Order 9066 which officially ended Reconstruction.
B He was commanding the Southern troops and resisted giving up command.He was commanding the Southern troops and resisted giving up command.
C He negotiated the settlement between Radical and Moderate Republicans.He negotiated the settlement between Radical and Moderate Republicans.
D He removed troops from Florida as stipulated in the Compromise of 1877.

D He removed troops from Florida as stipulated in the Compromise of 1877.