The Demise of Communism as an Economic and Political System

The demise of communism as an economic and political system can be explained by all of the following facts except:

A) communism is not an effective economic system.
B) relatively superior performance of the world's market economies.
C) communism works when the currency exchange rate is weak.
D) difficult to manage national economies with a single central plan.
E) increased public participation in matters of state.