Which one is not one of the three appeals of an argument that Aristotle postulated:

It is postulated that a cure for the disease will have been found by the year 2020. A: challenged B: assumed C: deducted D: decreed

It is postulated that a cure for the disease will have been found by the year 2015. A: challenged B: assumed C: deducted D: decreed

It is postulated that a cure for the disease will have been found by the year 2000. A: challenged B: assumed C: deducted D: decreed