How can farmers reduce pesticide water pollution? 

A)  by not using biological methods of pest control 
B)  by applying pesticides freely to crops during rain 
C)  by not using integrated pest management 
D)  by controlling runoff

Controlling runoff by implementing practices such as buffer strips, contour farming, and conservation tillage can reduce pesticide water pollution. Using biological methods of pest control and integrated pest management can also reduce the use of pesticides and their negative impact on water resources. Applying pesticides during rain can increase water pollution, so it should be avoided.