The Collapse of the Federal Post-Civil War Reconstruction Program in the South

The collapse of the federal post-Civil War Reconstruction program in the South involved party politics, in that it was sparked by:

A) deep divisions within the Democratic Party over the program's direction.
B) Democratic anger at the Republicans' attempts to convert the South into a Republican stronghold.
C) division among national Republicans about the program, as well as violent resistance by whites in the South, a Democratic stronghold before the war.
D) southern white Democrats' resentment over what they saw as a lack of sufficient economic development funding from Republicans in Congress.