Which of the following factors allow for irrigated farming in the arid southwest of the united states?
a. the vast mineral deposits
b. extremely fertile soils
c. the intricate river systems
d. ample water from the snowmelts

The correct answer is - C. The intricate river systems.

The rivers like the Colorado River and the Rio Grande, were the main factor that enabled the people living in the arid southwestern part of the United States to practice farming. These rivers were crucial for both, providing freshwater for drinking, as well as water for irrigation of the plants. People made multiple canals that made it all much more efficient, and thus managed to have a stable food source.