Which of the Following Is a Reason for the Fall

Which of the following is a reason for the fall of socialism in the former USSR and Eastern Europe?

A) Their economies had vastly over-produced, compared with capitalist economies.
B) The control of people was too rigid.
C) Their system eliminated political elites, but created economic elites.
D) Their living standards, while non-stratified, were too high.
E) Their system allowed their media too much freedom.