Which of these is NOT a reason that CAP was constructed?

The correct answer relates to a clarification of the primary objectives behind the construction of the Central Arizona Project (CAP). The CAP was designed primarily to bring additional water supplies to meet the needs of the state, particularly focusing on agricultural, urban, and environmental considerations.

While facilitating urban and suburban growth is a benefit of the CAP, it was not the primary reason for its construction. The initial motivation centered on ensuring a reliable water supply for agriculture, which was crucial for the economy and food production in Arizona.

Additionally, enhancing recreational opportunities, like creating reservoirs and recreational areas along the canals, was part of the benefits envisioned from the project. Supporting environmental restoration projects also became an important aspect of the CAP, particularly as awareness grew of the need to maintain ecological balance in the areas affected by water diversions.

Thus, while urban and suburban growth benefited from the CAP's construction, it was not among the core purposes that drove the project's development compared to the other options which align more directly with the fundamental objectives of the program.