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During the 1945 conference in Potsdam

AChurchill replaced Clement Atlee as prime minister of Britain
BStalin reneged on his pledge to enter the war against Japan in the Pacific
Cthe Big Three decided that Poland, Bulgaria, and Romania would be independent
Dthe Big Three formalized the plan to divide Germany into four zones of occupation

Verified Answer :

During the 1945 conference in Potsdam "D. the Big Three formalized the plan to divide Germany into four zones of occupation" since this was at a stage in the world where it was clear that Germany would lose. 

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