Which of the Following Helped Foster the Establishment of Communist

Which of the following helped foster the establishment of communist states in Eastern Europe after 1945?

A) Public revulsion against the failure of the Western democracies to stop Hitler,resulting in the defeat of their allies at the polls.
B) Soviet diplomatic pressure,political infiltration,and military power.
C) A massive infusion of Soviet economic and technical aid,hastening the rebuilding process.
D) Persistent ethnic conflict,exacerbated by the earlier Nazi occupation.
E) Soviet propaganda that showed the superiority of the socialist vision of the future over that of the capitalist West.