Answer: C is correct (the security arrangements that Stalin made to protect himself).
Explanation: the term "Iron Curtain" was used for the first time by Winston Churchill in American town of Fulton (Missouri) in 1946 (so-called "Fulton Speech). At that time Churchill was a ex-prime-minister, but the phenomenon of "Iron Curtain" was quite visible even from the UK.
George washington went to Mount Vernon after his retirement devoting his attentions to making the plantation as productive as it had been before he became president.
As he did throughout his life, Jefferson strongly believed that every American should have the right to prevent the government from infringing on the liberties of its citizens. Certain liberties, including those of religion, speech, press, assembly, and petition, should be sacred to everyone.
C. They controlled the trade of salt, gold, and ivory across the Sahara.
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