What is the greatest source of water pollution? 

A)  sediment from erosion 
B)  runoff of agricultural chemicals 
C)  drainage from urban areas 
D)  runoff of animal waste from farms

Water Pollution

The contamination of water bodies (e.g., lakes, rivers, oceans, aquifers) by harmful substances or heat, negatively affecting aquatic ecosystems and human health.

Agricultural Chemicals

Substances such as fertilizers, herbicides, and pesticides used in farming to enhance plant growth and protect crops from pests and diseases.

Sediment

Particulate matter that settles at the bottom of a liquid or is transported by water, wind, or ice.