The correct answer is C . Proposal requests are procurement documents used to obtain supplier proposals when the buyer needs a proposed solution, approach, technical method, commercial offer, or delivery strategy for the required work. In procurement practice, a request for proposal is appropriate when the buyer knows the business need or desired outcome but wants suppliers to propose how they would meet that need. The evaluation is usually based on more than price; it can include technical quality, methodology, supplier capability, risk, schedule, innovation, compliance, and value. Option A is not correct because the request normally comes from the buyer or customer side, not from the contractor to the supplier as a general definition. Option B describes a price-focused request, closer to a request for quotation or bid, where the solution is already clearly defined and price is the main selection criterion. Proposal requests are especially useful where the scope is complex, the solution is not fully predetermined, or supplier expertise is needed to shape the delivery approach. The uploaded source text shows this question and the partial alternatives, with the concept clearly positioned under procurement practices.
Reference topics: procurement, request for proposal, supplier proposal, procurement documentation, supplier selection.
