Why was the iron curtain a problem?

a.) it prevented the allies from knowing what the soviets were up to.
b.) the soviets were participating in the cold war.
c.) it blockaded access to berlin.
d.) it separated north and south korea

The answer is A.)  It prevented the Allies from knowing what the Soviets were up to.

The Iron Curtain was an imaginary barrier that blocked the west from the east , it represents the Soviet's efforts to block contact from non-Soviet entities from the west.

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