What Was the American Federation of Labor (AFL)

What was the American Federation of Labor (AFL) ?

A) It was a group of separate national unions organized by delegates from craft unions and primarily concerned with securing concrete economic gains.
B) It was a union that grew rapidly because it only comprised larger manufacturing industries such as steel, textiles, and tobacco.
C) It started out as industrial unions that joined with craft unions to increase their bargaining power and adopt a unified identity.
D) It was a governmental organization initiated by Congress to get a better sense of workers' needs before passing legislation.
E) It was established in response to the thriving organized labor movement signaled by the Homestead Steel strike and Pullman strike.