Final answer:
Disputes about the reasonableness of a proposition can be resolved objectively through moral realism and the concept of telos.
Step-by-step explanation:
Disputes about the reasonableness of a proposition, such as X, can be resolved objectively in some cases. This requires following an objective standard called moral realism, which asserts that morality has an objective foundation. The objective standard comes from the concept of telos, which focuses on the fulfillment of a goal. By assessing whether an action fulfills a goal, we can objectively determine whether it is good, bad, or neutral. This standard should be followed because it provides a basis for making true moral claims and allows for ethical discussions to improve our understanding of morality.