Besides the Fact That Its All-Inclusive Membership Undermined Its Unity

Besides the fact that its all-inclusive membership undermined its unity, why did the Knights of Labor collapse in the late 1880s?

A) Workers became disillusioned when a series of unauthorized strikes failed.
B) A large percentage of the population became alienated by the union's failure to offer membership to black workers.
C) Its attempts to bribe elected officials led to embarrassing scandals.
D) Skilled workers became angered by the union's plan to help unskilled workers.
E) The union's support of Karl Marx angered many capitalists.