In the Supreme Court Decision in U

In the Supreme Court decision in U.S. v. Lopez (1995) , what federalism issue was at stake?

A) The ability of the Congress to regulate interstate commerce as a police power regarding handgun proximity to schools
B) The ability of the Congress to regulate interstate commerce as a police power regarding transport of arms across state boundaries
C) The ability of the Congress to regulate interstate commerce as a police power regarding the imposition of national mandates on racial equality in hiring and promotion procedures within local law enforcement departments
D) The ability of the President to utilize executive orders to impose/enforce affirmative action dictates