Which knowledge area encompasses defining project scope and creating the Work Breakdown Structure (WBS)?

Correct answer: Project Scope Management

Option C, Project Scope Management, is correct because it is the PMBOK knowledge area specifically responsible for defining what is and is not included in the project, collecting requirements, defining scope, and creating the Work Breakdown Structure (WBS) which decomposes deliverables into manageable work packages. Option A, Project Quality Management, is wrong because it focuses on ensuring the project meets its quality requirements through quality planning, assurance, and control activities, not on scope definition or WBS creation. Option B, Project Schedule Management, is wrong because it covers planning and controlling the timeline, defining activities, sequencing them, and estimating durations, which requires a WBS as an input but does not produce it. Option D, Project Cost Management, is wrong because it deals with estimating, budgeting, and controlling project costs, and while it uses the WBS, it does not create or manage the scope definition process.