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Which of the following is true of regulations on car emissions?

A

They started on the state level and then became a federal government policy.

B

They were mandated by the federal government but is and paid for by the states.

C

They became a federal policy under the National Environmental Policy Act of 1969.

D

They are the focus of the Clean Air Act of 1990.

E

They do not allow states to alter the acceptable level of car emissions.

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