WorldWar I drastically changed the political and cultural climate in Europe. Which of the following was NOT among the changes brought about by World War I ?

A. Germany was defeated and blamed for causing the war.
B. In the course of World War I, the Bolsheviks came to power in Russia.
C. Successful parliamentary democracies were established throughout the continent and remained stable until the outbreak of World War II in 1939.
D. By the end of the 1920s, almost every state that had participated in World War I faced an economic depression and political upheavals.