The correct answer is B. The Soviet Union.
Explanation
The Soviet Union, also known as the Union of Soviet Socialist Republics, was a group of countries with a socialist ideology that existed between 1922 and 1991. Among the countries that were part of this union were Armenia, Azerbaijan, Belarus, Georgia, Kazakhstan, Kyrgyzstan, Lithuania, Latvia, Moldova, Russia, Turkmenistan, Uzbekistan, Estonia, and Tajikistan. During the Second World War, the Soviet Union allied itself with the United States and England, with whom it managed to defeat the force of the opposite side, which was Germany and Italy (on European territory). After the end of the Cold War, the victorious countries divided up the territories controlled by Nazi Germany that had been defeated, so that the Soviet Union led by José Stalin took control over the territories of Poland, Hungary, Romania, Bulgaria, Czechoslovakia, and East Germany until its disintegration in 1991. From the above, the correct answer is B. The Soviet Union.