Fidel castro likely referred to african americans as "the most politically advanced group" in the united states because:

Fidel Castro strongly believed in socialism, in which he wanted unity for the people for them to have freedom. With this unity perception, he had respect African-Americans for their strong ability to lead people and the power of speech for change. He wanted the system to change so badly. 

Ithink it’s b yep lelelelel

Answer might be b i think