Centre City enacts an ordinance that bans the distribution of all printed materials on city streets. Diners Caf$$ opposes the city$$s latest $$revenue$-$enhancing$$ measure$$a tax on prepared food sales$$and wants to protest by distributing handbills. In Diners$$ suit against the city, a court would likely hold the ban on printed materials to be

a$.$ unconstitutional under the First Amendment.

b$.$ unconstitutional under the commerce clause.

c$.$ constitutional under the First Amendment.

d$.$ not subject to the U$.$S$.$ Constitution.