The most appropriate subject matter expert (SME) to confirm the current business process and elicit deeper understanding of CK's goals, opportunities, and pain points is the supply chain manager. The supply chain manager is responsible for overseeing the flow of goods from the warehouse to the customer, and has the most knowledge and insight into the current business process. The supply chain manager can also provide valuable feedback and suggestions for improving the business process and achieving the desired outcomes. The sales manager and the chief financial officer are not directly involved in the business process of moving orders from the warehouse to the customer, and may not have the same level of expertise or interest as the supply chain manager. References: Customer Discovery, Get Started with Salesforce Business Analyst Certification Prep, Cert Prep: Salesforce Business Analyst