The correct answer is C) it was unsuccessful because the Teamsters were too strong.
The nonviolent protest affected the UFW's cause in that it was unsuccessful because the Teamsters were too strong.
César Chavez (1927-1993) was a Mexican American labor leader that always fought to support the rights of the farmers and other workers. He organized protests, marches and other non-violent demonstrations. He called for boycotts in many factories and even he went of hunger strikes to support worker's protests. In 1972, the AFL-CIO accepted the United Farm Workers Union as a permanent member.
The other options of the question were A) it was beneficial as seen in the results of Chavez's hunger strike. B) it was effective because MLK approved the methodology. D) it was ineffective because Chavez had a history of violence.