There Are Extensive Federal Regulations Covering Airplanes and Pilots

Multiple Choice

There are extensive federal regulations covering airplanes and pilots.Assume that the state of Missouri passes a statute containing numerous requirements,some conflicting with the federal rules,covering the licensing of airplane pilots and the operation of aircraft.A pilot's constitutional challenge to this state statute would most likely succeed on the basis of:

A) the preemption doctrine.
B) the Equal Protection Clause.
C) substantive due process.
D) the state police power.
E) the exclusive doctrine.