1. How did the Soviet Union fall?

The unsuccessful August 1991 coup against Gorbachev sealed the fate of the Soviet Union. Planned by hard-line Communists, the coup diminished Gorbachev's power and propelled Yeltsin and the democratic forces to the forefront of Soviet and Russian politics.

Soviet Union began a slow process of democratization that eventually destabilized Communist control and contributed to the collapse of the Soviet Union.

A number of events and uprisings in the 1980 are led to the collapse of the Soviet Union. ... Last, in the Soviet Union, the failed August Coup in 1991 led to the end of the Communist party in USSR. All of these events led to the end of communism and the making of a democratic Russia.

it collapsed on  December 26, 1991

the answer is b. hope this