Massahampshire's milk industry has been slowly declining over the past few years. The state legislature, in an effort to boost local milk sales, passes a law requiring local companies charge thirteen$-$cents per gallon less for their milk than the prices established by federal law. The plan works and local milk companies once again thrive. Is the state law valid?

YES, because the state interest here is compelling.

NO$,$ because the federal law preempts the state law.

NO$,$ because the law discriminates against out$-$of$-$state companies.

YES, because the state interest here is legitimate.