Who was the politician who introduced the term “Iron Curtain”?

prime minister Winston Churchill

Explanation:

"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 former British prime minister Winston Churchill in a speech at Fulton, Missouri, U.S., on March 5, 1946."

b) that he was not a free man

bismarck believed in using force

is the correct answer!