During the Cold War, the North Atlantic Treaty Organization (NATO)

During the Cold War, the North Atlantic Treaty Organization (NATO) and the Warsaw Pact were

A) blocs of states that represented U.S. and Soviet interests, respectively.
B) blocs of states that represented Soviet and U.S. interests, respectively.
C) formal alliances that subsequently served as models for the United Nations.
D) organizations that worked together to make superpower cooperation a reality.
E) alliances whose work proved invaluable to the success of a revitalized League of Nations.