Why is a drip irrigation system more sustainable than traditional spraying methods of irrigating crops?

A. It leads to reduced river flow.

B. It causes the water table to drop.

C. It reduces pollution from runoff.

D. It decreases water quality.

The appropriate answer is c. It reduces pollution from runoff. Drip irrigation supplies water directly to the roots of the plants. This reduces loss of water from infiltration and evaporation. Water with nutrients is supplied directly to the roots of plants and so this reduces the chance of excess water infiltrating the soil and contaminating the ground water with pollutants.