B) The professional success of Jackie Robinson and Willie Mays.
Explanation:
Jackie Robinson was the first African American man to play in Major League Baseball. Robinson broke the color barrier on April 15, 1947. This proved to be a momentous moment, as Jackie had a significant amount of success in his first year. Robinson was named Rookie of the Year in 1947, showing that the integration of the MLB.
Quakers, believed that all men and women were equal in the eyes of God and should listen to their "inner light" or conscience to guide their spiritual connection with God and the Bible