Final answer:
The option that is not considered an action-reaction pair according to Newton's third law is d) Force of block on rope - Force of mason on rope, as the forces act on the same object (the rope) instead of on different objects.
Step-by-step explanation:
According to Newton's third law, for every action force there is a reaction force equal in magnitude but acting in the opposite direction, and these forces always act on different bodies. In the case of the options provided, the one that isn't considered an action-reaction pair is d) Force of block on rope - Force of mason on rope. This is because the action-reaction forces need to act on different objects, while both forces in option d act on the same object, the rope. Instead, a correct action-reaction pair would involve the force of the mason on the rope and the force of the rope on the mason, or the force of the block on the rope and the force of the rope on the block, not a combination of forces from both the mason and block on the rope.