Which agency would assist the Coast Guard in managing oil and hazardous materials?

The Environmental Protection Agency (EPA) is the correct agency that assists the Coast Guard in managing oil and hazardous materials. The EPA's primary mission revolves around protecting human health and the environment, which includes regulating and responding to incidents involving oils and hazardous substances.

In incidents such as oil spills, the EPA collaborates with the Coast Guard under the National Response Framework to provide support in monitoring and managing the environmental effects of such situations. This includes cleanup efforts, risk assessments, and ensuring compliance with environmental laws and regulations. The EPA has specific authority under the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) which facilitates its involvement in such hazardous material management activities.

While other agencies mentioned have important roles in related areas, such as energy regulation or oceanic and atmospheric research, their focus does not specifically align with the management of oil and hazardous materials in the way that the EPA's does. The understanding and authority that the EPA has in environmental protection and hazardous responses make it the primary federal partner to support the Coast Guard in these critical response efforts.