A project sponsor is trying to use the ROI to determine if the project should...

ROI (return on investment) is a business-case concept used to evaluate whether the benefits/value of a project justify the investment. In CompTIA Project+ (PK0-005) objectives, ROI is explicitly referenced under “Business case or business objective – Return on investment (ROI)” as an artifact used during the discovery/concept and initiation work to support approval decisions.

Option C best matches that need because it focuses on the value the project will bring after the investment (benefits/returns). This value description is what the sponsor compares against the project’s expected costs to judge attractiveness and prioritize investments.

Option A (current vs desired outcome) can help define the problem and target state, but it isn’t ROI itself. Option B describes procurement documentation such as a statement of work/contract-style responsibilities, which is not the sponsor’s ROI input. Option D focuses on operational costs (OpEx) in normal operations; while OpEx may be part of the financial picture, ROI is specifically about investment return, not just “normal operations” cost analysis.