Which of the Following Is True for Air Pollution Controls

Which of the following is true for air pollution controls on transportation provided by the Clean Air Act?

A) Under the Clean Air Act, no manufacturer may sell vehicles subject to emission standards without prior certification from the EPA that the vehicles meet the required standards.
B) The 1970 Clean Air Act required a reduction by 1976 of 60 percent in the amount of the carbon monoxide and hydrocarbons emitted by automobiles.
C) To satisfy the requirements of the 1970 Clean Air Act, manufacturers could rely on already existing technology to meet the pollution control standards.
D) The 1970 Clean Air Act does not provide for the regulation and registration of fuel additives such as lead.