Which part of pesticide regulation is primarily concerned with environmental safety?

The Pesticide Registration Process is primarily concerned with environmental safety because it involves assessing the potential impacts of pesticides on the environment before they are approved for use. During this process, regulatory agencies evaluate scientific data regarding a pesticide's effects on non-target organisms, soil, water systems, and overall ecosystem health. This evaluation helps ensure that any pesticide registered for use will not cause significant harm to the environment, fulfilling crucial requirements intended to protect natural resources and biodiversity while addressing human health concerns as well.

In contrast, the other options focus on different areas of pesticide regulation, such as promoting pesticides, ensuring the safety of workers who handle them, or setting guidelines for how pesticides can be marketed, which do not primarily prioritize environmental safety.