What challenges does Arizona face regarding its water supply?

B is the correct choice because Arizona faces significant challenges regarding its water supply primarily due to drought conditions, a rapidly growing population, and competing demands for water from agricultural, urban, and environmental needs.

In terms of drought, Arizona often experiences prolonged dry spells that limit the availability of surface and groundwater resources, which significantly affects both agricultural practices and urban water supply.

Population growth adds additional strain, as more residents require water for domestic and industrial use, intensifying competition for available water resources. Additionally, the dependence on the Colorado River, which has seen diminished flow due to over-allocation and climate change, exacerbates these challenges.

The competing demands highlight the struggle between various sectors—agriculture typically consumes a significant percentage of water, while cities and municipalities seek to ensure adequate water supply for their residents. Balancing these competing interests becomes complex, making effective water management a critical issue for Arizona's future sustainability.

The other options do not capture the reality of Arizona's water situation. An abundance of water resources and too much snowfall do not accurately represent the state's arid conditions and limited water sources. Similarly, while treatment facilities play a role in water management, the primary challenges stem from the environmental, demographic, and policy pressures impacting water availability.