A project manager is working on a project.

This question belongs to the People domain because it focuses on stakeholder communication and engagement. When business unit managers complain about not receiving updated project information, the likely issue is that stakeholder information needs are not being met by the current communication approach. PMI guidance emphasizes planning communications systematically and tailoring them to stakeholder needs. Reviewing the communications management plan and the stakeholder register is the most appropriate next step because those artifacts define who needs what information, how often, and through which channels.

Option A is not the main issue, because the complaint is about information flow rather than role ownership. Option B may help some stakeholders, but it assumes meetings are the right answer for everyone without checking actual needs. Option D is unrelated, since Monte Carlo simulation is a quantitative risk-analysis technique, not a communication diagnostic tool. PMP-style reasoning favors first reviewing the planned communication approach and stakeholder records, then adjusting communication methods as needed. This ensures the response is structured, targeted, and aligned with official communication management practices.