Final answer:
Surface runoff of pesticides from fields or lawns is an example of non-point source pollution, which collects contaminants from large areas and leads them into water bodies. The correct answer is B.
Step-by-step explanation:
An example of a non-point source of pesticide contamination is b. Surface run off of pesticides from fields or lawns. This happens when rainfall or irrigation water runs over the land, collecting pollutants like pesticides from a wide area. These pollutants are then carried into bodies of water, contributing to non-point source pollution, which is a significant cause of water quality issues as it comes from multiple diffuse sources.