Which of the Following Was a Prime Factor for the Economic

Which of the following was a prime factor for the economic collapse in Eastern Europe immediately following the end of the Cold War?

A) the loss of subsidized natural gas and oil from the Soviet Union coupled with the collapse of Soviet markets made it impossible for Eastern European industries to operate and compete
B) the markets of Western Europe stopped buying products from Eastern European nations
C) the devastation of bombing from the Cold War between 1945-1989 had reduced Eastern Europe into ruins
D) the nations of Eastern Europe were forced to pay back massive loans which they had taken out from Germany, France and England
E) the removal of Soviet troops translated into a major loss of revenue from soldiers spending their paychecks in the local economy