Correct Answer:
B. 1991
This question tests knowledge of a significant historical event: the dissolution of the Soviet Union.
- Foundational Concept: The Soviet Union, a socialist state in Eurasia, existed from 1922 until its dissolution in 1991.
- Correct Answer (1991): The USSR officially ceased to exist on December 26, 1991. This followed a period of political and economic turmoil, culminating in the Alma-Ata Protocol and the resignation of Mikhail Gorbachev.
- Why other options are false:
- 1989: This year marked the fall of the Berlin Wall and the beginning of the collapse of communist regimes in Eastern Europe, but the USSR itself was still intact.
- 1997: This date is too late; the USSR had already dissolved.
- 1999: This date is also too late, well after the Soviet Union's collapse.