One of Stalin's Key Goals After the Defeat of Germany

One of Stalin's key goals after the defeat of Germany and Japan was to

A) maintain friendly relations with the United States and Great Britain despite any conflicts of interest.
B) expand Russian lands as far and wide as possible.
C) support all national communist groups that were vying for postwar control of their countries.
D) establish the Soviet Union as the world's most dominant naval power.
E) establish a buffer zone to protect the Russian core of the Soviet Union from yet another invasion.