Answer:
D.that Soviet-style Communism would take over the world
Explanation:
The US, England and the USSR met at Crimea, in the Yalta Conference, shortly after the war was over. They pointed out the new policy for the "New World order", and soon differences emerged between Stalin and Roosevelt & Churchill.
The vision of a world dominated by a communist country that would expand to take over adjacent countries and eventually become rival to the U.S. in the globe was a major concern that provoked the Cold war.
The Soviet influence in the European stage quickly became a focus of major tensions and the peak of the tensions became when Berlin Airlift occurred, only to be followed by the Cuban Missile Crisis.
In both cases, ever-present fear of an assumed threat from the Communist world was in the discourse, policy and spirit of the Cold war era.
