The correct answer is B) the member countries of NATO and the Warsaw Pact.
This map of North America and Europe in 1955 shows the member countries of NATO and the Warsaw Pact.
The former members of NATO were the United States, the United Kingdom, France, Spain, Portugal, The Netherlands, Iceland, Belgium, Canada, Denmark, Italy, Luxembourg, and Norway. The former members of the Warsaw Pact were the Soviet Union, Bulgaria, Albania, Hungary, Poland, Czechoslovakia, Romania, and East Germany.
it increase by 12% a year from 1812-1820