Exam PMP topic 1 question 551 discussion

in this scenario, PM already indentify the issue and next step need to escalete the issue to high manager

But why not B?

D. Follow the project escalation policy and communications management plan

PMBOK: Five alternative strategies may be considered for dealing with opportunities, as follows: uu Escalate. This risk response strategy is appropriate when the project team or the project sponsor agrees that an opportunity is outside the scope of the project or that the proposed response would exceed the project manager’s authority. Escalated opportunities are managed at the program level, portfolio level, or other relevant part of the organization, and not on the project level. The project manager determines who should be notified about the opportunity and communicates the details to that person or part of the organization. It is important that ownership of escalated opportunities is accepted by the relevant party in the organization. Opportunities are usually escalated to the level that matches the objectives that would be affected if the opportunity occurred. Escalated opportunities are not monitored further by the project team after escalation, although they may be recorded in the risk register for information.

Why? Can someone please explain? Thanks