The correct option is
B Created a sphere of influence for the United States in the Western Hemisphere
The Monroe Doctrine of 1823 forbade future
colonization in the Western Hemisphere and warned the European powers
not to interfere in the affairs of the Americas. Thus, it created a
sphere of influence for the United States in the Americas. Supported by
England, the Monroe Doctrine required no enforcement. The colonies
already held by the European nations in the Americas were not to be
interfered with under the terms of the Monroe Doctrine, and it appeared
to be more a policy of isolation than a policy of involvement. The
American System proposed by Henry Clay was a vision for the United
States in which the United States would become more self-sufficient, but
this was not part of the Monroe Doctrine.