Unequivocally D. This is a simple rational basis test. Just because the government can't outlaw your speech doesn't mean they have to give you a platform. If you choose to use the platform the government offers, you have to accept the restrictions they place on that platform so long as they apply to everyone equally, aren't related to the content of your speech, and don't discriminate against you on the basis of you being a suspect class. White Power Grunge EDM Deathcore Rock musician is not a suspect class...it just has no class.