Answer:
B. Agriculture
Step-by-step explanation:
Before the dust storms, a large portion of Oklahoma thrived off of its fine soil and healthy grass that held it in place. However, many farmers used traditional farming methods and plowed deep into the ground. On top of that, the topsoil was heavily grazed by cattle and sheep, leaving behind significant damage. Leading into the 1930s, a great drought hit the area. Combining all of these issues, great dust storms & clouds raged over the land and forced settlers to board up in their homes. The lands were ravaged and often ruined. Thus, Oklahomans realized the importance of their crops and agriculture to their economy.