What is a responsibility of the Environmental Protection Agency (EPA)?

The responsibility of the Environmental Protection Agency (EPA) includes registering all types of disinfectants sold and used in the United States. This process ensures that any disinfectant that enters the market has been evaluated for safety and effectiveness, particularly in its ability to kill pathogens that can cause diseases. By requiring registration, the EPA helps protect public health by ensuring that disinfectants meet necessary standards and do not pose risks to consumers or the environment.

In contrast, while the EPA plays a role in environmental safety and regulation, its focus does not include setting specific guidelines for esthetics practices or providing education on skin care, which fall under different regulatory bodies or educational institutions. Conducting research on environmental hazards is indeed a function of the EPA, but it is broader in scope and doesn't pertain specifically to the regulation of disinfectants as implied in the correct answer.