Which of the following series of events describes the economic history of the Soviet Union and chronological order after Stalin’s death
1. Khrushchev's reforms in the 1950s and early 1960s, including allowing for limited economic decentralization and agricultural reforms.
2. Brezhnev era stagnation in the 1970s and 1980s, characterized by a lack of economic growth and innovation.
3. Gorbachev's perestroika reforms in the late 1980s, aimed at restructuring the Soviet economy and introducing market mechanisms.
4. Collapse of the Soviet Union in 1991, leading to the transition to a market economy in newly independent states.