How do farmers contribute to water pollution?
a. by dumping garbage into the water
b. by fertilizing their crops with nitrogen compounds
c. by fertilizing with sulfur dioxide
d. by not using fertilizers

The best answer is B. Farmers contribute to water pollution by fertilizing their crops with nitrogen compounds. Fertilizers have high contents of nutrients which includes compounds with nitrogen. This may contribute to water pollution when farmers overfertilize their crops which some of the fertilizers run off to bodies of water and may cause eutrophication.