President Monroe's message influences U.S. foreign policy by warning the European nations not to interfere in the affairs of the Western Hemisphere.
Monroe Doctrine was policy adopted by President Monroe to influence the nation foreign policy.
Monroe Doctrine provides that any intervention by external powers in the politics of the U.S is a potentially hostile act against the US.
In conclusion, the Option D is correct because his message influences the U.S. foreign policy by warning the European nations not to interfere in the affairs of the Western Hemisphere.
