Which of the following best explains why the Soviet union collapsed?

There are multiple factors that contributed to the collapse of the Soviet Union, including economic stagnation, political repression, nationalism among its member states, and a lack of popular support for the communist system. However, one of the primary reasons for the collapse was the inability of the Soviet economy to keep up with the rapid pace of technological advancements and global competition. This led to widespread shortages of consumer goods, declining living standards, and ultimately economic crisis. The Soviet Union's centralized economic planning and inefficient bureaucracy were unable to address these problems effectively, leading to its eventual downfall.