This question is incomplete, here´s the complete question.
What was the outcome of the Tehran Conference?
a plan for the D-Day invasion on the Western Front
a plan for involving Iran in the war
a plan for involving North Africa in the war
a plan to end the war in the Pacific
Answer: a plan for the D-Day invasion on the Western Front.
Explanation:
The Tehrān Conference (November 28–December 1, 1943) was a meeting between U.S. President Franklin D. Roosevelt, British Prime Minister Winston Churchill, and Soviet Premier Joseph Stalin in Tehrān, Iran.
The main issue was the opening of the second front in western Europe, and the Us would end up guaranteeing the opening of the second front in France by the spring of 1944.