The correct answer is D) to prevent European powers from influencing Latin America.
The Monroe Doctrine was issued to prevent European powers from influencing Latin America.
US President James Monroe knew that the United States had the power and international presence to take a stand before European powers. North American and Latin American issues should be resolved without any intervention of European countries. That is why in 1823 and before the US Congress, President Monroe delivered a message to be understood by European nations. They should not ever try to intervene in Latin American issues because that would represent a hostile act against the United States. This foreign policy was known as the "Monroe Doctrine."
The answer is B, communism. This is easy to remember because Europe colonized Africa, and basically enslaved the native peoples. Europe is never associated with communism, so it would not make sense for them to be fighting it.