Biology

C.Pesticides and fertilizers

Explanation:

A major cause of agricultural runoff is the use of pesticides and fertilizers. These chemicals are commonly applied to crops to control pests and promote growth. However, when it rains or when irrigation occurs, these chemicals can wash off the fields and enter nearby water bodies, such as rivers, lakes, and oceans. This runoff carries excess nutrients like nitrogen and phosphorus, which can lead to eutrophication (nutrient pollution) and other environmental problems, such as harmful algal blooms and oxygen depletion.

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