What did the Soviet Union do that led Britain and the United States to undertake the Berlin Airlift?

O A. Built the Berlin Wall?
O B. Set up a blockade of Berlin?
O C. Placed an embargo against U. S goods ?
O D. Established the Warsaw Pact?

So i think A

Explanation:Because The Berlin Airlift: The Partitioning of Berlin

The agreements split the defeated nation into four “allied occupation zones”: They gave the eastern part of the country to the Soviet Union and the Western part to the U.S. and Great Britain. ... The Soviets were dissatisfied with this arrangement.

well 1 they have there leader that controls them