The Ku Klux Klan Virtually Collapsed in the Late 1920s

The Ku Klux Klan virtually collapsed in the late 1920s when

A) the immigration restriction laws of the early 1920s were repealed.
B) the organization was publicly exposed as a corrupt and cynical racket.
C) the advent of radio led to a new level of public knowledge and tolerance.
D) the Klan proved unable to implement its program.
E) both political parties sharply criticized the Klan as un-American.