Final answer:
The main idea of this passage is that the Dust Bowl caused hardships for people.
Step-by-step explanation:
The main idea of this passage is B. The Dust Bowl caused hardships for people. The passage describes how the dust storms and drought in the southern Plains during the 1930s affected the land and made it impossible for farmers to grow crops, leading to difficulties in feeding their families. Additionally, the land became dusty and dry, and the swirling dust made it hard for people to breathe. This overall theme of hardships caused by the Dust Bowl is the main idea of the passage.