Branch Rickey's "Social Experiment" with Jackie Robinson Was Significant Because

Branch Rickey's "social experiment" with Jackie Robinson was significant because:

A) no other black athlete had ever competed against white athletes in a professional sport before Robinson.
B) the history of the Negro Leagues had suggested that black players lacked the talent to play against white players in Major League Baseball.
C) Major League Baseball had been segregated and was the most popular professional sports league in the U.S. at the time.
D) Robinson's talent was marginal.