What was the iron curtain?
o a line of guns and canons that the soviets spread across eastern europe
o
the imaginary wall separating communist countries from democracies
o the security arrangements that stalin made to protect himself
o a powerful agreement forged at yalta at the end of world war ii

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.

tell him great job!

explanation: