What Led to the Decline of the Ku Klux Klan

What led to the decline of the Ku Klux Klan in the 1920s?

A) People across the country began to see them as common terrorists and many began to denounce their ideas of racism.
B) Its leaders began to fight among themselves; also, a Klan leader was convicted of raping a young white woman who later died.
C) The Great Depression limited income, so many whites could no longer afford the expensive membership.
D) The Supreme Court declared it a dangerous, subversive organization.