What Best Describes the "Monroe Doctrine

What best describes the "Monroe Doctrine"?

A) The Monroe Doctrine was an executive order by U.S.President Monroe recognizing the right of southern states to have slaves and to transport them all across the United States as needed.
B) The Monroe Doctrine was an executive order by U.S.President Monroe recognizing the right of southern states to have slaves but prohibiting the transport of slaves outside the South.
C) President Monroe warned the European powers not to expand their colonial empires in the Western hemisphere any further.
D) U.S.President Monroe declared the republican form of government as the ideal for the Western hemisphere.
E) President Monroe claimed for the United States the territory from the borders of Jefferson's Louisiana Purchase to the Pacific Ocean.