Although human economic exchange predates historical records, it is clear that the very first economies were based on barter and that money came later. This can be inferred from occasions in history when, in isolated places, currency largely disappeared from the local economy. At such times, the economy typically reverts to the original barter system, but then quickly abandons this form of exchange when currency becomes available again. Which one of the following most accurately describes a flaw in the argument's reasoning? ['The argument concludes that something can cause a particular outcome merely because it is necessary for that outcome.', 'The argument relies on a premise that presupposes what the argument attempts to show in the conclusion.', 'The argument contains premises that contradict one another.', 'The argument presumes that something should be done merely because historically it has been done.']