Final answer:
MLB (Major League Baseball) was the first major professional league in the US to integrate in modern times and include non-white players.
Step-by-step explanation:
The first major professional league in the US to integrate in modern times and include non-white players was c) MLB (Major League Baseball). Although there were African American players in the early years of baseball, a formal ban prevented black players from playing in the major leagues after Moses Fleetwood Walker left Toledo because of the racism he faced. It wasn't until April 15, 1947, when Jackie Robinson broke the color barrier and became the first African American to play baseball in the National League for the Brooklyn Dodgers.