What were the issues that farm workers confronted in their struggle to end economic exploitation?

 The symptoms of farmworker exploitation and the more flamboyant aspects of farmworkers’ efforts to gain fair contracts from the growers have become quite well-known. Much less known by equally important is a story which deals with the nitty-gritty of the farmworkers’ struggle for economic dignity: their efforts to form a nation-wide farm workers union. 

Ithink it’s c , good luck on whatever : )