The correct answer is C. Both A and B. A project plan should include, among other elements, the project scope, risks, assumptions, and constraints. The project plan is the integrated reference document that describes how the project will be executed, monitored, controlled, and closed. Scope defines what the project is expected to deliver and the boundaries of the work. Risks identify uncertain events or conditions that could affect project objectives. Assumptions describe factors considered true for planning purposes, even though they may later require validation. Constraints define limiting conditions, such as fixed deadlines, budget ceilings, regulatory obligations, resource limits, contractual requirements, or technology restrictions. These elements are interconnected: assumptions and constraints influence scope, risk exposure, schedule, cost, quality, and resource planning. A project plan that includes only scope and risks would omit the planning logic behind them. A plan that includes only assumptions and constraints would not adequately define the deliverables or uncertainty profile. Therefore, both sets of information are necessary for sound integrated project management.

Reference topics: project plan, scope, risks, assumptions, constraints, integrated planning.