A local television station is considering a plan to create a panel of child psychologists to review programs in advance of their airing and rate the level of violence. A program that portrays a high level of violence would be listed in newspapers with four guns after the title. On the other hand, if a show has little violence, one gun would appear after its listing. The station believes that this remedy would forewarn parents about the level of violence in any given program. Which one of the following must the television station assume in order to conclude that the plan will meet its stated purpose? ['There would be fewer shows rated with one gun than with four guns.', 'Parents would read and pay attention to the ratings listed in the newspapers.', 'The local television station has an obligation to forewarn parents of the level of violence in television shows.', 'The rating system described in the passage is the most effective system available.']