Answer :
All of them, John Steinbeck, Dorothea Lange and Woody Guthrie contributed to the third option (C.) more and more Americans becaem aware of the problems of migrants. For example, Woody Gthire wrote a song Deportee, as a protest song. It was inspired by the plane crash in which he considered the racist mistreatment of the passengers before and after the accident. Here are some of the facts "The crash resulted in the deaths of 32 people, 4 Americans and 28 migrant farm workers who were being deported from California back to Mexico".