During the approval meeting with the stakeholders, another stakeholder, who has not previously provided input, challenges the project baseline. After lengthy discussions, it becomes clear that final approval cannot be given. What is the appropriate action for the project manager to take?
A、Clarity the details of the baseline and evaluate the input date from the planning process
B、Explain to the stakeholder why this input cannot be considered at this stage of the project
C、Ask the stakeholder to formulate a change request to evaluate the new situation
D、Insist on project plan approval and investigation of the new input at a stage