One thousand people in Denmark were questioned about their views on banning cigarette advertising. The sample comprised adults who are representative of the general population, and who, ten years previously, had been questioned on the same issue. Interestingly, their opinions changed little. Results show that 31 percent are in favor of such a ban, 24 percent are against it, 38 percent are in favor, but only for certain media, and 7 percent have no opinion. The survey results in the passage best support which one of the following conclusions? ["Most of Denmark's population favors some sort of ban on cigarette advertising.", "Most of Denmark's population does not smoke cigarettes.", "A minority of Denmark's population feels that banning cigarette advertising would set a bad precedent.", "People's opinions never change very much."]