A state statute requires that all buses which operate as common carriers on the highways of the state shall be equipped with seat belts for passengers. Transport Lines, an interstate carrier, challenges the validity of the statute and the right of the state to make the requirement. What is the best basis for a constitutional challenge by Transport Lines?
Violation of the due process clause of the Fourteenth Amendment. Violation of the equal protection clause of the Fourteenth Amendment. Unreasonable burden on interstate commerce. Difficulty of enforcement