Jackie Robinson paved the way for other African American athletes to join MLB by doing which of the following?

retaliating against pitchers who threw balls at him

quitting Major League Baseball and starting his own league for African American players

losing his temper with fans and players

proving himself as a player and not allowing those who teased him to get the better of him

4th option:

Jackie Robinson's sheer talent and hard work made him the first black player to be signed for MLB by Brooklyn Dodgers.

Explanation:

Jackie Robinson started at first base in a a game for Brooklyn Dodgers and became the first black player for MLB. before him, black players played in their separate league. the success of Jackie Robinson paved the way for many players to follow.

Jackie ended his career as one of the most successful athletes of his time and influenced many through his views on non violence and inspirational life.