How did the Cold War end?

During 1989 and 1990, the Berlin Wall came down, borders opened, and free elections ousted Communist regimes everywhere in eastern Europe. In late 1991 the Soviet Union itself dissolved into its component republics. With stunning speed, the Iron Curtain was lifted and the Cold War came to an end.

i believe the answer is d. it was not uncommon for people to faint or even convulse at these high-energy meetings.