Which of the following is the best description of a reason the Soviet Union collapsed?

A.
Gorbachev allowed glasnost.

B.
The Star Wars defense system was successful.

C.
Gorbachev allowed political parties other than his own.

D.
A civil war broke out in the Soviet Union.

A civil war broke out.

Explanation:

A civil war happened because of political events. Then people overthrew the government.

Be sure to double check on google.  

C

Explanation:

Gorbachev allowed political parties other than his own.

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