Which of the following statements are correct with reference to the disintegration of the Soviet Union?

(A) Gorbachev initiated policies of economic and political reform (perestroika and glasnost) within the Soviet Union in 1985.
(B) Lithuania became the first of the 15 Soviet republics to declare its independence in 1990.
(C) Russia, Belarus and Ukraine established the Commonwealth of Independent States (CIS) in 1991.
(D) Three Baltic republics of Estonia, Latvia and Lithuania became members of the UN in 1991.

Choose the correct answer from the options given below:

(A), (B), (C) and (D)

The correct answer is Option (3) → (A), (B), (C) and (D)

(A) Gorbachev initiated policies of economic and political reform (perestroika and glasnost) within the Soviet Union in 1985. Correct. Mikhail Gorbachev became the General Secretary of the Communist Party of the Soviet Union in March 1985 and soon after introduced these landmark reforms.
(B) Lithuania became the first of the 15 Soviet republics to declare its independence in 1990.Correct. 
(C) Russia, Belarus and Ukraine established the Commonwealth of Independent States (CIS) in 1991.Correct. 
(D) Three Baltic republics of Estonia, Latvia and Lithuania became members of the UN in 1991. Correct.