What Was Winston Churchill Referring to in 1946 When He

What was Winston Churchill referring to in 1946 when he spoke in Missouri about an "iron curtain"?

A) the division that had developed between President Truman's loyal supporters in his home state and his opponents in the rest of the country.
B) a division between Soviet-dominated Eastern Europe and the rest of the continent.
C) the barrier that had to be established in order to contain communism within its existing boundaries.
D) the cultural and intellectual barrier that prevented Westerners from understanding Asia.
E) the atomic espionage ring supposedly organized by Klaus Fuchs.