Question

which factor encouraged farmers to leave their land in the great plains during the 1930s?
the promise of free land in california
the promise of free trips to the west
the necessity of finding new land in oklahoma
the necessity of escaping financial problems

Explanation:

In the 1930s, the Great Plains faced the Dust Bowl, which destroyed farmland, paired with the Great Depression causing severe financial ruin for farmers. They could not sustain their farms, so escaping these financial crises was the key driver. The other options are incorrect: California did not offer free land, there were no free trips west, and Oklahoma was part of the drought-stricken Great Plains, not a destination for new viable land.

Answer:

the necessity of escaping financial problems