What was the main reason for the Ku Klux Klan’s success in the South a

What was the main reason for the Ku Klux Klan’s success in the South after 1868?

a. popular support from whites of all social classes for white supremacy
b. its centralized political organization
c. its support from the southern state Republican governments
d. the persistent threat of a violent black uprising against the white planter class
e. the Force Act, which protected terrorist groups like the Klan from being arrested

ANSWER
A