The correct answer to this open question is the following.
Although there are options attached we can say the following.
The three reasons Cesar Chavez and Dolores Huerta felt Mexican American worker's rights were being violated were the following.
1.- They felt that agribusiness was imposing conditions that resulted unfavorably to Mexican workers.
2.- Mexican workers received low salaries, compared with white American people earn by the hour.
3.- Mexican workers labored for long hours under difficult and sometimes risky conditions, with no health insurance.
Cesar Chavez and Dolores Huerta were two Mexican-American activists that fought for their rights of Mexican immigrant workers in the United States. They organized and mobilized workers to demand better working conditions and their strength grew in numbers to the degree that in 1962, Cesar Chavez and Dolores Huerta formed the National Farm Workers Association.