This question is related to race integration in sports and economics. I am pretty confident the answer is either A or B but i'm having trouble...

This question is related to race integration in sports and economics. I am pretty confident the answer is either A or B but i'm having trouble finding information to pick the right one.

Integration was much faster in football than in baseball because:

A.the owners in the NFL were less discriminatory than the owners in MLB

B.of the competition provided by a rival league

C.football fans are far less disriminatory than baseball fans

D.football had to get the approval of liberal-minded colleges and universities