The purpose of the Monroe Doctrine was?

1. A Option A: to warn the Japanese to steer clear of the Caribbean in exchange for U.S non-intervention in Afghanistan
2. B Option B: to warn European powers to keep away from the Western Hemisphere in return for U.S nonintervention in Europe
3. C Option C: to conquer the Soviet regime and attach Siberia to the United States
4. D Option D: to let the world, know who the superpower is