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What was the "Iron Curtain" that Winston Churchill referred to?

 It refers to the fact that Eastern Europe was more or less controlled by the Soviet Union.

Explanation:

Winston Churchill had been the Prime Minister of Great Britain during World War II. It was Churchill who coined the term Iron Curtain in a 1946 speech he delivered in Missouri.

peasants’ war, (1524–25) peasant uprising in germany inspired by changes brought by the reformation, peasants in western and southern germany invoked   divine law to demand agrarian rights and freedom from oppression by nobles and landlords. as the uprising spread, some peasant groups organized armies. although the revolt was supported huldrych zwingli and thomas müntzerits condemnation by martain luther contributed to its defeat, principally by the army of the swabian league. some 100,000 peasants were killed. reprisals and increased restrictions discouraged further attempts to improve the peasants’ plight.

i think it would be " a" i might be wrong tho

do you have a list of sources to choose from?