Question

The Monroe Doctrine of 1823 warned Europe to stay out of the Americas, and the U.S. would stay out of European affairs. Why was this foreign policy effective, and why did Europe accept it?
A Constant fighting had weakened the European countries.
B It benefited Great Britain, and the British navy helped enforce it.
C France and Italy were afraid of American expansion into Europe.
D European countries had already divided up all of the New World.

Answer 1

It's 'It benefited Great Britain, and the British navy helped enforce it.'