Consider the writing prompt. Explain the factors that led to the Berlin Airlift. Which evidence would be most useful in addressing the topic laid out by the prompt?

The prompt asks what factors led to the Berlin Airlift, so the most useful evidence is what happened before it began. The Soviet Union cut off all land access to West Berlin, creating the need to bring supplies to the city by air. The other choices describe the airlift’s duration or its effects, not the cause that led to it.

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