Which of the following was true of both the Cuban Missile Crisis and the Berlin Blockade and Airlift?
A commom feature of the Berlin Blockade and Airlift (1948-49) and of the Cuban Missile crisis (1962) was that in both situations,
A. the United Nations used its reputation to broker a peaceful solution
B. the international community braced for the possibility of a global nuclear war
C. the potential for a direct armed conflict between the two superpowers was high
D. a crisis was resolved by a face-to-face meeting of the Soviet and the American leaders
The only possible answer here is C. You might be tempted to put B as the answer, but you should not do that.
The reason that B is not correct is that, in 1948-9 there was not really any chance of a global nuclear war. It was not until the end of August, 1949 that the Soviet Union even conducted a successful nuclear test. This means that there was absolutely no way that a global nuclear war could have broken out over the Berlin blockade. At this point, the US did have atomic bombs, but it did not have the missile technology to deliver them so it would have had to rely on bombers.
This means that the only possible answer is C. In both cases, there was a high risk of armed conflict between the US and the USSR.