Which of the Following Statements Regarding Automobile Pollution Is True

Multiple Choice

Which of the following statements regarding automobile pollution is true?

A) If states do not adopt their own set of automobile pollution standards, they must abide by those of the federal government.
B) California and New York are the only two states with separate automobile pollution standards.
C) States have the right to adopt California standards instead of federal rules.
D) Because of federal standards, motor vehicles are no longer a major source of air pollution.