Using complete sentences, explain the impact of large-scale agriculture in the southwestern United States on our water
supply

Southwestern area of the United States take water from the Colorado river for irrigation and 90% of the water of river is diverted here. This causes shortage in the supply of drinking water.

Explanation:

Large scale agriculture is the agriculture which takes place at a large rate and helps the farmers and the peasant to earn their own livelihood and supply the food grains and other crops in the market for commercial purposes.

Since it is done on a large scale, water supply becomes very important for this purpose. In the southwestern area of the United States also irrigation is provided by dams which takes water from the Colorado river. This will lead to shortage of drinking water.

the answer is the last option or letter d)