One of the important decisions made at the Yalta Conference was ___________.
A、the allied landing at Normandy
B、the setting up of a world organization, the United Nations, to manage peace and security after the war
C、coordinated efforts in war against Japan
D、none of the above
【正确答案】：B
【题目解析】：本题考查雅尔塔会议。根据课本P213可知，雅尔塔会议作出的一项重要决定是成立一个世界组织，即联合国，以便在战后管理和平与安全。
