The correct answer to this open question is the following.
Although there are no options attached we can say the following.
In a speech given on March 5, 1946, British Prime Minister Winston Churchill said an "iron curtain has descended across the continent". What was Churchill describing in his speech?
Former British Prime Minister Winston Churchill referred to the Berlin War that divided East Germany from West Germany.
Winston Churchill's "Iron Curtain speech" referred to the control and dominance the Soviet Union was exerting over some European countries, establishing what he called "an iron curtain that has descended across the continent."
Those were the satellite nations that teh Soviet Union controlled. The USSR considered them as a "buffer state" in the case western nations tried to invade the Soviet Union. We are talking about East Germany, Czechoslovakia, Bulgaria, Romania, Poland, and Albania.
Churchill delivered this speech on March 5, 1946, in a College in Fulton, Missouri, before US President Harry S. Truman. Both men expressed their concerns about the international scenario and USSR activities under the leadership of Joseph Stalin that wanted to spread Communism in different nations.
