The bush administration bring about the collapse of the soviet union by
a) opposing gorbachev's reforms
b) supporting gorbachev's reforms
c) negotiating arms reductions
d) ending the cold war

The best answer that we could get would be the second choice. President Bush trusted Mikhail Gorbachev more than President Reagan did, and he supported Gorbachev's reforms which led to the eventual collapse of the Soviet Union.

Hope my answer has come to your help.