Medical and recreational use of marijuana is an issue that demonstrates the tension between federal and state laws. If the preemption doctrine were followed, the result would be that:
A. State laws decriminalizing marijuana would override federal laws.
B. Federal laws prohibiting marijuana would override any state laws.
C. State laws legalizing medical but not recreational marijuana would preempt federal laws.
D. The Supreme Court would have to determine the constitutionality of state laws.