Why did the Soviet Union block off supply routes to W. Berlin?

On June 24, Soviet forces blocked the roads and railroad lines into West Berlin. ... In West Berlin, panic began to set in as its population worried about shortages of food, water, and medical aid. The United States response came just two days after the Soviets began their blockade.

On June 24, Soviet forces blocked the roads and railroad lines into West Berlin.In West Berlin, panic began to set in as its population worried about shortages of food, water, and medical aid. The United States response came just two days after the Soviets began their blockade

The Soviets offered to drop the blockade if the Western Allies withdrew the newly introduced Deutsche Mark from West Berlin. The Western Allies organised the Berlin airlift (26 June 1948 – 30 September 1949) to carry supplies to the people of West Berlin, a difficult feat given the size of the city's population.

its perfect how it was

what are the options?