A statute of the State of Europhia made it a misdemeanor to construct any building of more than five stories without an automatic fire sprinkler system. A local construction company built in Europhia a nine-story federal office structure. It constructed the building according to the precise specifications of a federal contract authorized by federal statutes. Because the building was built without the automatic fire sprinkler system required by state law, Europhia prosecutes the private contractor. Which of the following is the company's strongest defense to that prosecution?

Select one:

A. The state sprinkler requirement denies the company property or liberty without due process.

B. As applied, the state sprinkler requirement violates the obligation of contracts clause.

C. The state sprinkler requirement denies the company equal protection of the laws.

D. As applied, the state sprinkler requirement violates the supremacy clause.