（ ） is primarily concerned with defining and controlling what is and is not included in the project.

题目中的关键词是"is primarily concerned with defining and controlling what is and is not included in the project"，意思是主要关注定义和控制项目中包含和不包含的内容。这指的是项目范围管理，因为项目范围管理是确定项目边界和包含内容的。选项C是“Project Scope Management”，符合题意，因此是正确答案。