Answer:
A - The war world led to an upsurge in the price of wheat and grain, and thus necessitated the increased demand for wheat and grain, consequently farmers began to employ over farming practices in order to increase agricultural output, in the processes of which they depleted the top soil and this subsequently led to the Dust Bowl of 1930s.
Explanation:
The Dust Bowl of 1930s was a period when devastating dust storm, erosion, drought, climate change and global warming dealt a devastating blow on the ecology and agricultural landscape of the great plain. The World War 1 has been argued to be one of the contributory factors or event that led to the Dust Bowl of 1930s. The war led to an increased demand for wheat and grain as well as other agricultural products, so farmers and sharecroppers sought a way to increase their agricultural output, and then resorted to unholy and unhealthy agricultural practices which include plowing the soil and digging. The also employed mechanized farming all in the bid of increasing agricultural productivity. However, these unwise decision led to an increased porous landscape and subsequent erosion, drought, dust storm, high temperature, etc. These destroyed the ecology of the Great Plain, and finally led to an exodus of farmers from the Great Plain to the Westward, especially California which had a promising gold industry.