Which of the Following Was a Consequence of the Teheran

Which of the following was a consequence of the Teheran Conference of December 1943?

A) Stalin announced that the Soviet Union would withdraw from the Grand Alliance if it could secure a separate peace with Germany.
B) Churchill and Roosevelt agreed that the next major Allied campaign would be a strike against Vienna through the Balkans.
C) Stalin, over the objections of Churchill and Roosevelt, insisted that Russian troops would enter the war in the Pacific in January 1944.
D) The three Allied leaders finally agreed that Operation Overlord would be launched in early 1944.