Answer :
C 100% sure. He organized migrant farm workers in the struggle for better wages and conditions.
The answer is:
C.He organized migrant farm workers in the struggle for better wages and conditions.
César Cháve was a mexican american farm worker that co´-founded the United Farm Workers union, and worked as an activist for the rights of the farm workers, he was appointed the presidential medal of freedom in 1994, his work and the work of the union helped improve the quality of life and the work security for many farm workers.