Answer:
The United Farm Workers union would have been most concerned with the plight of migrant workers.
Thus Option B is correct.
Step-by-step explanation:
The United Farm Workers union would have been most worried with the situation of migrant workers. During the period of 1930s thousands of farmers migrated to California as they lost everything in a natural disaster. They had nothing to eat no other source to live there.
The Farmers who took the lands on rent were not able to pay their rents. All these things created a lot of burden on the lives of farmers and a result of this they migrated to California in search of life and living hood.