answer and reason with brief description?

16) A supply manager and his assessment team are seeking to begin a spend analysis project as part of the organization's strategic sourcing program. Which of the following should be the first step for the assessment team to attain a successful spend analysis result? A. Review the approved supplier list and identify the key suppliers. B. Work with the stakeholders to identify and collect the most accurate spend data. C. Understand the market conditions of its key products. D. Review historical savings attained through strategic sourcing