This question fits the Process domain because it concerns communication planning, coordination, and progress visibility across multiple dependent work streams. PMI communication guidance explains that a communication management approach should be based on stakeholder needs and should define how information will be generated, distributed, and understood. When stakeholders say coordination and visibility are lacking, that points to a weakness in the communication approach itself, not just a one-time meeting problem.
Therefore, the best action is to review and update the communications management plan. This allows the project manager to improve reporting frequency, communication channels, dependency tracking, escalation paths, and stakeholder visibility in a structured and sustainable way. Option C may help temporarily, but it does not correct the underlying communication framework. Options A and D escalate too early before the project manager has used the proper project management process to address the concern. PMP logic generally favors fixing the process before escalating. Updating the communications plan is the strongest answer because it directly addresses the stakeholder complaint and improves coordination across the project in an organized, repeatable manner.