The correct answer to this open question is the following.
Unfortunately, you forgot to attach the options for this question.
However, trying to help you we can comment on the following.
What is not a reason why the Great Plains farmers are able to grow corn and soybeans social studies is "It rains often there."
Farmers in the Great Plains faced many problems and difficulties. The Plains had difficult weather to live in.
What happened in the Great Plains when severe drought followed the removal of native grasses was that strong winds blew away topsoil and created the so-called Dust Bowl.
In the 1930s, the Great Plains lived difficult moments when severe dust storms hit this region of the United States. The dryness due to lack of water, the removal of native grasses, combined with climate conditions, produced these dust storms that killed animals and ruined the crops. There was no way to keep on farming the land and people had to move to the Pacific West, to California, where they had to start a new life.