The project manager can help influence the processes that affect change on projects by creating and using the most appropriate planning strategies and tools. Assuming the project manager has created and is executing the best possible project management plan, the project sponsor should help the project manager to protect the project against unnecessary changes. Which of the following best reflects the phrase, "influencing the factors that affect change?"

A. Telling people that changes are not allowed after planning is complete B. Determining the sources of changes and fixing the root causes C. Adding more activities to the work breakdown structure to accommodate risks D. Calculating the impact of changes to date on the project