Answer :
Answer:
He had become president after the death of Franklin Roosevelt.
Explanation:
Harry Truman represent the United States at the Potsdam Conference because Harry had become president after the death of Franklin Roosevelt.
who was Harry Truman?
Harry Truman served as the 33rd President of the United States from 1945 to 1953. He was a long-time member of the Democratic Party and served as a US Senator from Missouri from 1935 to 1945.
He was chosen as incumbent President Franklin D. Roosevelt's running mate in the 1944 presidential election.
Thus option B is correct.
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