Answer:
D. They were dependent on and controlled by the nearby Soviet Union.
Step-by-step explanation:
Since World War II and the establishment of zones of interest between the Western Allies and the USSR, the countries of Eastern Europe came under U.S.S.R. influence. Soviet representatives and leaders continuously managed those countries' legislatures, their elections, and the overall strategy.
The Warsaw Pact was created for this reason, among several other things, as a unilateral military power controlling the complete Eastern bloc.
Therefore the option D is correct