Essayist: Human history is filled with the longing for eternal youth and immortality. Yet aging and death are normal and inevitable, indeed even desirable. Just imagine the ethical, social, and economic consequences that would result if it ever became possible to prevent them. The claim that human history is filled with the longing for eternal youth and immortality figures in the essayist's argument in which one of the following ways? ['It is one of the conclusions of the argument, though it is not the main conclusion.', 'It is a claim that the argument as a whole is directed toward discrediting.', 'It introduces the subject of the argument, but plays no logical role in establishing the main conclusion.', 'It sets out a problem to which the argument as a whole maintains there is no satisfactory response.']