The correct answer is - A. The low cost of living in the southwestern United States.
The low cost of living in the southwestern part of the United States is not a push factor to move away from the region, but on contrary, it can be a push factor for the people to move in in this part of the country. If someone has a nice job, or even an averagely payed job, and lives in this part of the United States, than the person will have a better life and can afford more things because the standard of living is relatively low in comparison to the other parts of the country.
