Answer: D.) The Soviet suppression of democracy in Poland and East Germany!
Step-by-step explanation:
D.) The Soviet suppression of democracy in Poland and East Germany. This was an example of Soviet aggression during the Cold War, and it was an example of the Soviet Union's desire to expand its control and influence. By showing that the Soviet Union was willing to suppress democracy in its own satellite states, it demonstrated that Kennan's claims about Soviet aggression were true and that the Cold War was indeed a struggle between two competing power blocs.