Question

what wwii conference was the last attended by franklin roosevelt before the end of his presidency?
the yalta conference
the tehran conference
the potsdam conference

Explanation:

Franklin D. Roosevelt attended the Yalta Conference (February 1945) as his last WWII conference before his death in April 1945. The Tehran Conference was in 1943, and the Potsdam Conference (1945) was attended by Truman (Roosevelt had died).

Answer:

the Yalta Conference