问题：
[单选题]
在建设工程监理过程中，要保证项目的参与各方围绕建设工程开展工作，使项目目标顺利实现，监理单位最重要也最困难的工作是（ ）。
A、合同管理
B、组织协调
C、目标控制
D、信息管理
参考答案：
B
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