If Congress Imposes a Regulation on Business, the States

If Congress imposes a regulation on business, the states:

A) may not have any regulations in the same area of concern
B) may adopt regulations to replace the federal regulations, but they may only apply inside the borders of the state
C) may impose stronger conditions on out-of-state businesses that come to the state than are imposed by the federal rules
D) usually may pass rules that would reduce the effect of the federal rule inside the state, if justified by special local conditions
E) none of the other choices