Which of the following best describes a responsibility of the EPA under CERCLA?

The responsibility of the EPA under the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA), commonly known as the Superfund law, primarily focuses on overseeing the cleanup of contaminated sites. This law empowers the EPA to respond to hazardous substance releases and to manage the cleanup process to protect public health and the environment. The agency identifies and prioritizes sites requiring cleanup, ensures that proper remedial actions are taken, and monitors the progress of these cleanup efforts to ensure compliance with safety standards.

The other options, while related to environmental protection and waste management, do not accurately reflect the specific duties of the EPA under CERCLA. Training private companies in waste management, lobbying for environmental laws, and managing public waste disposal practices fall outside the direct responsibilities outlined by CERCLA, which is primarily about site remediation and ensuring that affected areas are restored to safe conditions.