People often praise poems for their truth. But to argue that expressing true propositions contributes to the aesthetic merit of a poem is misguided. Most of the commonplace beliefs of most people are true. Whatever the basis of poetic excellence is, it must certainly be rare rather than common. Which one of the following most accurately describes the role played in the argument by the claim that whatever the basis of poetic excellence is, it must certainly be rare rather than common? ["It is a premise that, in conjunction with another premise, is intended to support the argument's conclusion.", 'It is the overall conclusion drawn by the argument.', "It is a premise offered as the sole support for the argument's conclusion.", 'It is a proposition for which the argument seeks to advance an explanation.']