Answer :
Final answer:
The Tehran Conference is the conference that set the date for D-Day, or Operation Overlord. This conference was attended by the "Big Three": Churchill, Roosevelt, and Stalin. The key decisions made there included the plans for the cross-channel invasion of Europe which became D-Day.
Explanation:
The conference that set the date for D-Day, or Operation Overlord, was the Tehran Conference. This conference was held November 28 – December 1, 1943, involving the "Big Three": British Prime Minister Winston Churchill, U.S. President Franklin D. Roosevelt, and Soviet Premier Joseph Stalin. The main decisions made in this conference included plans for the cross-channel invasion of Europe (which resulted in D-Day) and the agreement to recognize Iran's independence. Keep in mind that the invasion was initially planned for May 1944 but actually occurred on June 6, 1944.
The Potsdam and Yalta conferences, mentioned in the choices, were significant World War II conferences too, but they took place after the Tehran Conference, and thus after the planning for D-Day. The Casablanca Conference was also important, but the key decisions made there did not directly relate to D-Day.
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