Answer:
B West Berlin remained free of Soviet Control
Explanation:
It's not A because the Truman doctrine was issued before that event
It's not C because the Americans would never in a trillion years would allow the Soviets to have West Berlin since they both were big rivals against each other during the Cold War.
It's not D because there were a bunch of other crisis's that happened after this, like the Berlin crisis were both Soviet and Americans forces were on each of there side in Berlin, almost probably starting a huge war with the Soviets.
I say it's B because West Berlin never fell into Soviet hands and never showed that America can still retaliate.
