Lake City enacts an ordinance that bans the distribu-tion of all printed materials on city streets. Mackensie opposes the city's latest "revenue-enhancing" measure and wants to protest by distributing handbills. In her suit against Lake City, a court would likely hold the ban on printed materials to be

a. unconstitutional under the commerce clause.
b. constitutional under the First Amendment.
c. unconstitutional under the First Amendment.
d. not subject to the U. S. Constitution.