Which of the following is true of the political development of the South post-Civil War?…

Which of the following is true of the political development of the South post-Civil War?
A. Nearly all political competition in the region after the Civil War occurred within the Democratic Party, not between parties.
B. The Republican Party took swift dominance of the region after the Civil War.
C. The South following the Civil War remained deadlocked between the Republican and Democratic parties.
D. The South after the Civil War became a mishmash of many parties, none of which were able to take power.
E. The Civil Rights movement cemented Democratic control of the South.