The correct answer is C.
The grape boycott of the 1960's was a result of the Delano Grape Strike which started in September of 1965. This strike started due to the unfair treatment of grape workers by their bosses. This movement, lead by individuals like Cesar Chavez, ended up in millions of Americans boycotting grapes from the mid 1960's to 1970. This nonviolent protest ended up working as they received better pay, working conditions, and benefits.