Proofread the following text and correct the three subject-verb disagreements.

Read the short passage about the life of cesar chavez. cesar chavez is best known for his use of nonviolent means to draw attention to the poor working conditions of farm workers in the united states. chavez led marches, boycotts, and hunger strikes. it is even believed that these hunger strikes may have contributed to his death on april 23, 1993. chavez dedicated his life to improving the lives of farm workers. he used nonviolent means to fight for the improved treatment, pay, and working conditions of farm workers. he was instrumental in organizing one such famous strike against the california grape growers in 1965, a battle that lasted for years. at one point, chavez even called for a national boycott against the grape growers. his efforts over the years resulted in several victories for farm workers. after his death, chavez was awarded the presidential medal of freedom. which picture would be best to use on a yearbook page to illustrate cesar chavez’s contributions to society? a. a medal b. a dollar bill c. a grape d. a march