Final answer:
Option (C), Washington's stance implies that preserving national security and autonomy would be the positive outcome of U.S. isolation from international political affairs.
Step-by-step explanation:
According to Washington, if the U.S. remains isolated from international affairs, the positive result would be the preservation of national security and autonomy (Option C). Washington's foreign policy advice was to engage in friendly trade with other nations while avoiding entangling alliances that could drag the United States into international conflicts and wars.
His perspective can be interpreted as suggesting that by focusing on domestic affairs and avoiding international political alliances, the nation may better preserve its security and control over its own policies.