Final answer:
The Dust Bowl caused a decline in population as people left in search of job opportunities.
Step-by-step explanation:
The correct answer is A. The population declined as millions left for job opportunities.
The Dust Bowl, which occurred during the 1930s in the Southern Plains states, was a severe drought and wind erosion that devastated agricultural lands. The lack of rainfall and the depletion of topsoil led to crop failures and widespread economic hardships for farmers.
As a result, many farmers and their families had to leave their homes and search for job opportunities elsewhere. This mass migration caused a significant decline in the population of the affected communities.
Learn more about Impact of the Dust Bowl on the communities of the Southern Plains states