The Text Suggests That the Primary Explanation for the End

The text suggests that the primary explanation for the end of the Cold War and the collapse of the Soviet Union was

A) exclusively because of failures within the Soviet Union, especially in its command economy.
B) entirely the result of the arms race initiated by President Ronald Reagan which bankrupted the Soviet Union.
C) mainly the result of failures within Soviet society but it was also influenced by Reagan's arms race policy.
D) environmental disasters in Central Asia and Siberia.
E) the weak leadership of President Boris Yeltsin.