When was the Treaty signed on the Creation of the USSR?

The correct answer is Option 3 - 1922

1991 December: Russia, Belarus and Ukraine decide to annul the 1922 Treaty on the Creation of the USSR and establish the Commonwealth of Independent States (CIS); Armenia, Azerbaijan, Moldova, Kazakhstan, Kyrgyzstan, Tajikistan, Turkmenistan and Uzbekistan join the CIS (Georgia joins later in 1993); Russia takes over the USSR seat in the United Nations.