Minimum Auto-Emissions Standards Are Uniform Across the Nation, Regardless of Local

Minimum auto-emissions standards are uniform across the nation, regardless of local conditions, but states can

A) set higher standards if they wish.
B) violate such standards for a period of five years.
C) interpret the standards in such a way as to make them meaningless.
D) be waived from compliance by the U.S. Senate.
E) set lower standards with the permission of the House of Representatives.