The u. s. constitution establishes a system by which power is shared between the national government and the state governments. however, if there is ever a conflict between a law passed by a state and one passed by the national government, which of the following is true?
a. courts will decide which of the two laws is supreme.
b. voters of the state will decide which law they prefer.
c. the national legislature will have to change the laws.
d. the law passed by the national government is supreme.