During project implementation, the marketing department informs the project manager that the product’s market requirements have changed. These changes were not anticipated, may significantly influence potential sales numbers, and could impact project scope.What should the project manager do?
在项目实施过程中，营销部门通知项目经理说，产品的市场需求已经发生变化。之前未成预料到这些变化，可能会显著影响调查的销售数量，并可能影响项目范围。项目经理应该怎么做？
A.Plan risk responses and update the risk register规划风险应对，并更新风险登记册
B.Apply forecasting method应用检测方法
C.Plan to use the contingently reserves and update the risk mitigation plan计划使用应急储备并更新风险减轻计划
D.Use earned value management (EVM) methods使用挣值管理（EVM）方法