Answer:
The answer would be B
Step-by-step explanation:
the Monroe Doctrine was created to firmly state to european powers that they were not to interfere with or colonize the Americas any longer, and the Americas, in return, were not to interfere with colonies that had already gained independence and colonies that were pre-existing
Think of it as a really really politically professional way of saying "leave me alone and ill leave you alone"
hope this helps :)