Which of the Following Is True Regarding Noise Pollution

Which of the following is true regarding noise pollution?

A) Noise is strictly an urban problem.
B) The Environmental Protection Agency (EPA) still enforces noise abatement through the Clean Air Act.
C) The EPA's role currently is to investigate and study noise and its effects and to evaluate the effectiveness of noise on the public's health and welfare.
D) The Federal Aviation Administration is yet to have procedures to respond to the public about aircraft noise questions or complaints within the U.S.