Answer: B - People who had been sharecroppers and tenant farmers migrated to California to find work after poor
farming practices and a ten-year drought caused the farmland of the Great Plains to become barren.
Step-by-step explanation:
The Dust Bowl of the 1930s was an era when dust storms, erosion, and drought destroyed the topsoil and devastated the ecology and agricultural practices in the great plain as a result of the over-farming practices of farmers ad sharecroppers. This period witnessed the highest migration from the great plain to California as farmers and sharecroppers whose farms and agricultural products had been destroyed by the Dust Bowl had to migrate for greener pastures.