Answer: D is correct. Citing the Roosevelt Corollary . . .
Explanation: The Roosevelt Corollary to the Monroe Doctrine was announced in 1905, a few years before the actions noted on the map took place.
Communism did not become a threat in Latin America until much later, after the end of World War II in 1945. In the 1950's the threat became apparent, and became real in 1959 when Fidel Castro led a revolution in Cuba and began a communist government there.