A is correct answer since this country has been described as communistic since the revolution that happened there between 1953 nd 1953. New government was established by Fidel Castro, that hasn't changed much of their political dogmas.
All other answers are wrong, since this countries are constitutional democracies, with a larger or smaller level of political development.
The changing ocean currents lead to climate cooling by bringing cooler breezes to places with higher climates. The cool breezes push the warm air out and leads to the drop of temperature
