How did cesar chavez fight?

Mexican American Cesar Chavez (1927-1993) was a prominent union leader and labor organizer. Hardened by his early experience as a manual laborer, Chavez founded the National Farm Workers Association in 1962. His union joined with the Agricultural Workers Organizing Committee in it's first strike against grape growers in California, and the two organizations later merged to become the United Farm Workers. Stressing nonviolent methods, Chavez drew attention for his causes via boycotts, marches and hunger strikes. Despite conflicts with the Teamsters union and legal barriers, he was able to secure raises and improve conditions for farm workers in California, Texas, Arizona and Florida

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The answer is option c.