The correct answer is B. As a result of the Postdam Conference, Germany was divided into four occupation zones, each controlled by an Ally.
The Potsdam Conference was a meeting held in Potsdam, Germany between July 17 and August 2, 1945. The participants were the Soviet Union, the United Kingdom and the United States, the most powerful members of the allies who defeated the Axis powers in World War II.
The agreement of Potsdam established the division of Germany in four zones of occupation (already agreed in the Yalta Conference), and a similar division of Berlin.