Jewel collectors, fearing that their eyes will be deceived by a counterfeit, will not buy a diamond unless the dealer guarantees that it is genuine. But why should a counterfeit give any less aesthetic pleasure when the naked eye cannot distinguish it from a real diamond? Both jewels should be deemed of equal value. Which one of the following principles, if valid, most helps to justify the reasoning in the argument above? ['The value of a jewel should depend at least partly on market demand.', 'Jewel collectors should not buy counterfeit jewels unless they are unable to distinguish counterfeit jewels from real ones.', 'The value of a jewel should derive solely from the aesthetic pleasure it provides.', 'It should not be assumed that everyone who likes diamonds receives the same degree of aesthetic pleasure from them.']