The correct answer is EPA or Environmental Protection Agency.
EPA is an autonomous agency of the US federal government for the protection of the environment. It has its headquarters in Washington D.C. The agency functions to conduct environmental research, assessment, and education. It holds the accountability of enforcing and maintaining national standards under various environmental laws, in consultation with tribal, state, and local governments.
It also coordinates with all the levels of government and industries in a broad range of voluntary prevention programs and energy conservation attempts.