What metaphor did Winston Churchill use to describe the division between the West and the Soviet Union?

Winston Churchill used the metaphor "The Iron Curtain" to describe the division between the West and the Soviet Union in his famous speech in 1946. This phrase vividly captured the ideological and physical barrier that separated Western democratic countries from Eastern communist countries following World War II. Churchill's use of "Iron Curtain" emphasized the severity and impenetrability of this division, suggesting not only a lack of communication and understanding but also a clear delineation of influence and power between the two blocs during the early stages of the Cold War.

The other choices reflect concepts related to the Cold War but do not have the same historical significance as Churchill's metaphor. The Berlin Wall, for instance, became a physical representation of the divide much later, in 1961, while "The Great Divide" and "The Cold Front" are less recognized phrases in the context of describing the geopolitical struggle of that era.