Explanation
The project manager should discuss the issue with the virtual team members and revise the communications management plan as an immediate corrective action. This is because the project manager needs to understand the reasons why the virtual team members are unable to join the regular project update meetings and find a solution that works for them. The project manager should also update the communications management plan to reflect the changes in the communication requirements, methods, frequency, and tools for the virtual team members. The project manager should ensure that the communication plan is aligned with the project objectives, stakeholder expectations, and organizational culture.
Option B is not a good action, as escalating this issue to the virtual team members' supervisors may not be appropriate or effective. It may also create conflict, resentment, and distrust among the team members. The project manager should try to resolve the issue directly with the virtual team members and not involve their supervisors without their consent or agreement.
Option C is not a good action, as adding this issue to the risk management plan and taking action if it persists is a passive and delayed approach. The project manager should try to prevent or mitigate the issue as soon as possible and not wait until it becomes a risk that affects the project performance. The project manager should also not treat the issue as a risk, but as a problem that needs to be solved.
Option D is not a good action, as discussing the issue with the project sponsors and adding this as an issue in the issue log is a reactive and formal approach. The project manager should try to solve the issue informally and collaboratively with the virtual team members and not escalate it to the project sponsors unless necessary. The project manager should also not document the issue in the issue log, but in the communication plan. References:
[PMBOK Guide], 6th edition, page 368, section 10.1
[PMP Exam Content Outline], page 10, task 5 under domain 2

According to the PMBOK Guide, the product owner is the person responsible for defining and prioritizing the product backlog, and ensuring that the product delivers value to the customer and stakeholders1. The product owner also collaborates with the project team and the project manager to review the work in progress and provide feedback2. Therefore, if a stakeholder has a new requirement or a change request, the correct procedure is to provide it directly to the product owner, who will evaluate it and decide whether to add it to the product backlog or not. The other options are not the correct procedures for new requirements in a hybrid project. The change control board (CCB) is a group of stakeholders who review and approve change requests in a traditional project, but not in a hybrid project that follows agile principles3. The project sponsor is the person or group who provides the financial resources and support for the project, but not the owner of the product requirements or scope. The project manager is the person who leads the project team and manages the project work, but not the person who defines or prioritizes the product backlog. References:
* 1: PMBOK Guide, 6th edition, page 49
* 2: PMBOK Guide, 6th edition, page 50
* 3: PMBOK Guide, 6th edition, page 115
* : PMBOK Guide, 6th edition, page 33
* : PMBOK Guide, 6th edition, page 51