The correct response that accurately describes the economic history of the Soviet Union in chronological order after Stalin's death is:
Under Stalin, the economy rapidly industrialized. This continued after his death before stagnating. It began declining under Brezhnev because he focused too much of the economy on the military. When Gorbachev instituted reforms to allow for private industry, the economy collapsed.
This response outlines the trajectory of the Soviet economy, noting the industrialization under Stalin, the stagnation and eventual decline under Brezhnev due to military focus, and the impact of Gorbachev's reforms, which led to significant economic challenges.