单选] 在一次冲刺计划会议上，一个干系人被告知，他们的需求正在进行，最终产品将在接下来的两个冲刺中完成。干系人对时间表非常满意，并对敏捷团队给予全力支持。会议结束后，项目发起人打电话给项目经理，说有一个大的需求，他们希望团队马上去做，因为它有很大的商业价值。项目经理应该怎么做？During a sprint planning meeting, a stakeholder is told that their requirement is in progress and on track for the final product to be ready in the next two sprints. The stakeholder is very satisfied with the timeline and gives their full support to the agile team. After the meeting, the project sponsor calls the project manager about a large requirement they want the team to work on right away as it has significant business value. What should the project manager do？