(A) 11
(B) 7
(C) 6
(D) ** 9
EXPLANATIONS BELOW
Concept note-1: -Poland and other states between Germany and the Soviet Union have sometimes been described as buffer states, both as non-communist states before World War II and later as socialist states of the Eastern Bloc.
Concept note-2: -In 1949, the prospect of further Communist expansion prompted the United States and 11 other Western nations to form the North Atlantic Treaty Organization (NATO). The Soviet Union and its affiliated Communist nations in Eastern Europe founded a rival alliance, the Warsaw Pact, in 1955.
Concept note-3: -After World War Two a Cold War developed between the capitalist Western countries and the Communist countries of the Eastern Bloc. Soviet leader Joseph Stalin wanted a buffer zone of friendly Communist countries to protect the USSR from further attack in the future.
Concept note-4: -The Warsaw Pact was a collective defence treaty established by the Soviet Union and seven other Soviet satellite states in Central and Eastern Europe: Albania, Bulgaria, Czechoslovakia, East Germany, Hungary, Poland and Romania (Albania withdrew in 1968).