Which of the Following Occurred During the Tehran Conference Where

Which of the following occurred during the Tehran Conference where Churchill, Stalin, and Roosevelt all met together for the first time?

A) They discussed the importance of developing an atomic weapon before Nazi Germany did and agreed to consult one another before using it.
B) They argued the entire time over how territories should be divided after Hitler's defeat, as Roosevelt felt Russia was no longer an important ally.
C) They formed a bond of genuine trust and warmth that would prove important to the future of the continued alliance long after the war ended.
D) They discussed the planned invasion of France and Russian offense across eastern Europe as well as made early plans for the United Nations.
E) They agreed on the importance of defeating Japan first before turning their attention to defeating Hitler's forces in Europe.