Which of the following is an environmental concern related to pesticide use?

Soil contamination is a significant environmental concern associated with pesticide use. When pesticides are applied to crops, they can leach into the soil and affect the quality of the soil ecosystem. This can lead to a decrease in soil health, affecting the organisms that live within it and disrupting natural processes essential for plant growth.

Soil contamination can lead to reduced biodiversity as beneficial microorganisms and insects may be harmed or killed by the chemicals. Furthermore, contaminated soil can impact water quality through runoff, where pesticides are washed into nearby water bodies, affecting aquatic life and potentially contaminating drinking water sources.

The other options refer to aspects of pesticide use that do not directly address environmental concerns. Increased crop yield, enhanced pest resilience, and lower pesticide costs are primarily economic and agricultural benefits that might arise from pesticide use but do not highlight the potential detrimental effects on the environment. Thus, soil contamination stands out as a critical concern that underscores the need for responsible pesticide management practices.