Answer : 2. "Work breakdown structure"
Explanation :

Answer: B) Work breakdown structure Explanation: Work breakdown structure is an important tool for project scope management.   Project Scope Management refers to the set of processes that ensure a project’s scope is accurately defined and mapped. Scope Management techniques enable project managers and supervisors to allocate just the right amount of work necessary to successfully complete a project—concerned primarily with controlling what is and what is not part of the project’s scope.