Libel is defined as damaging the reputation of someone by making false statements. Ironically, strong laws against libel can make it impossible for anyone in the public eye to have a good reputation. For the result of strong libel laws is that, for fear of lawsuits, no one will say anything bad about public figures. Which one of the following principles, if valid, most helps to justify the reasoning in the argument? ['The absence of laws against libel makes it possible for everyone in the public eye to have a good reputation.', 'If one makes statements that one sincerely believes, then those statements should not be considered libelous even if they are in fact false and damaging to the reputation of a public figure.', 'Public figures can have good reputations only if there are other public figures who have bad reputations.', 'In countries with strong libel laws, people make negative statements about public figures only when such statements can be proved.']