Who popularized the term "iron curtain"?

a. Harry Truman

b. George Kennan

c. Winston Churchill

d. Josef Stalin

C. Winston Churchill

- The term Iron Curtain had been in occasional and varied use as a metaphor since the 19th century, but it came to prominence only after it was used by the former British prime minister Winston Churchill in a speech at Fulton Missouri on March 5, 1946 when he said of the communist states from stetting in.