I believe it is the last and second one.
The Cultural Revolution was launched in China in 1966 and its tormented and violent legacy would resonate in Chinese embrace of bourgeois values and lack of revolutionary spirit.
Well, it's not the Ku Klux Klan, as that was a large group of people who wanted to have slaves all return to their work, I've never heard of C, and we barely touched on D in school. From what I've learned, however, the Freedmen's Bureau helped former slaves by supplying food, providing education and homes, etc.