Respuesta :

The end of the Cold War. When Mikhail Gorbachev assumed the reins of power in the Soviet Union in 1985, no one predicted the revolution he would bring. A dedicated reformer, Gorbachev introduced the policies of glasnost and perestroika to the USSR. ... The unraveling of the Soviet Bloc began in Poland in June 1989.

Answer:

pretty sure the answer is C

Explanation:

C.  the USSR could not compete economically with the US