Refer to this timeline of the Cold War and answer the question:

What was "the Iron Curtain" that Churchill described in his address to U.S. Congress?


The timeline specifies that the Iron Curtain was "across Europe," so that helps you eliminate (A) and (B). The Cold War had nothing to do with temperature, so you should also be able to rule out (C). The main conflict of the Cold War was between Western capitalist democracies and Communism, so you should select (D).

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