What is the primary reason the EPA classifies pesticides?

The primary reason the EPA classifies pesticides is based on the potential hazard they pose to humans. The classification system is intended to help ensure that pesticides are used safely and effectively, minimizing risks associated with exposure. This includes evaluating health effects, environmental impacts, and the safety of various products. By focusing on human health, the EPA aims to protect both agricultural workers and the general public from potential adverse effects that could arise from pesticide application. The classification informs regulations and guidelines that dictate how pesticides can be used, which helps in developing appropriate safety measures and usage protocols.

The other options relate to important aspects of pesticide use and regulation but do not encapsulate the primary driving factor behind the EPA's classification system. For instance, while the regulation of marketing and concern for agricultural use are vital for ensuring that pesticides are distributed responsibly and used effectively, these factors are secondary to the main goal of protecting human health. Promoting usage in large-scale farming is not a consideration in the classification process; rather, the focus remains on safety and risk management.