SAT US History Practice Question

All of the following events contributed to Cold War tensions EXCEPT the

1. A.rejection of the Treaty of Versailles by the isolationist Senate.
2. B.U.S. airlift of food to the citizens of Berlin.
3. C.massive economic support for Western Europe through the Marshall Plan.
4. D.united support of the Greek monarchy in 1947.
5. E.the establishment of the defensive North Atlantic Treaty Organization.