Event 1: Understanding the sequence of occurrences
- (A) Boris Yeltsin assumed leadership of the Communist Party in Moscow in 1990, a pivotal development preceding his significant role in the Soviet Union's dissolution.
- (B) In 1990, the Soviet Union granted Warsaw Pact nations autonomy in determining their future, indicating a move towards independence for former Soviet client states.
- (C) Boris Yeltsin was elected President of Russia in 1991, a crucial juncture in the Soviet Union's fragmentation, marked by the Russian Federation's declaration of independence.
- (D) Following the Soviet Union's collapse in December 1991, the Commonwealth of Independent States (CIS) was formed, comprising 11 ex-Soviet republics.
Event 2: Ordering the occurrences chronologically
- The correct chronological sequence of these events is:
1. (A) Boris Yeltsin is appointed head of the Communist Party in Moscow.
2. (B) The Soviet Union announces that Warsaw Pact members have the freedom to choose their own path.
3. (C) Boris Yeltsin assumes the presidency of Russia.
4. (D) The establishment of the Commonwealth of Independent States.
Event 3: Conclusion
The accurate order is (A), (B), (C), (D), designating option 1 as the correct response.