What area does the EPA specifically regulate?

The correct answer, which is environmental issues, reflects the primary focus and mandate of the Environmental Protection Agency (EPA). The EPA is tasked with protecting human health and the environment by enforcing regulations based on laws passed by Congress. The agency's responsibilities include regulating air quality, water quality, hazardous waste management, chemical safety, and other environmental concerns.

This means the EPA develops and enforces regulations that ensure the preservation of natural resources and the safety of the public in relation to environmental hazards. The agency plays a critical role in addressing issues such as pollution, climate change, and endangered species, all of which fall under the larger umbrella of environmental protection.