According to the PMBOK Guide, 6th edition, page 141, the project manager should engage with stakeholders throughout the project life cycle to ensure that their needs and expectations are met. When there are changes in the stakeholder environment, such as new or replaced stakeholders, the project manager should identify them and assess their impact on the project. The project manager should also review and prioritize the new requirements with the stakeholders and analyze how they affect the project scope, schedule, cost, quality, and risk. The project manager should then follow the change control process to submit, evaluate, approve, and implement the change requests that are needed to accommodate the new requirements. This approach ensures that the project manager maintains effective communication, collaboration, and alignment with the stakeholders, and delivers a product, service, or result that meets their needs and expectations.

The other options are not the best choices because they do not address the new requirements in a proactive and collaborative manner. Option B is not the best choice because it implies that the project manager is trying to avoid the new requirements and resist the change, which could create conflict and dissatisfaction among the stakeholders. Option C is not the best choice because it implies that the project manager is accepting all the new requirements without analyzing their impact and feasibility, which could lead to scope creep, unrealistic expectations, and poor quality. Option D is not the best choice because it implies that the project manager is imposing a rigid and inflexible approach to the project, which could alienate the new stakeholders and jeopardize their support and engagement.