Which migration-related problem is the Sun Belt experiencing?

The correct answer is B. Overused water resources.

The Sun Belt, which includes the southern United States, has experienced significant population growth due to migration. This influx has led to increased demand for water, which can strain local water resources, especially in areas that are already arid or experiencing drought conditions. As the population grows, the demand for water for residential use, agriculture, and industry can lead to overuse of these vital resources.

If you have more questions or need further explanation, feel free to ask!