If Oregon passed a statute that prohibited liquor stores from engaging in any kind of advertising, that statute would be (A)valid as an exercise of police power; (B) valid, as alcohol is illegal for minors.; (C) invalid as a violation of the Commerce Clause.; (D) invalid as an unreasonable restriction of free speech.

Answer:___D___Explanation:

The answer is "invalid as an unreasonable restriction of free speech" but I need help with the explanation.