Agile valuesactive stakeholder collaboration and transparency. The best way to address stakeholder concerns is toengage them directlyin the feedback loop. ThePMI Agile Practice Guide (Section 7.2: Stakeholder Engagement)andMike Griffiths' PMI-ACP Exam Prep Book (Chapter 4: Stakeholder Engagement)both recommend inviting stakeholders toiteration reviewsor demos to provide updates and gather feedback. * Option Cis correct: inviting the regional sales manager to the review fosters transparency and collaboration. * Option AandBdismiss valid stakeholder input, which goes against agile principles. * Option Dis overly cautious and does not proactively resolve the issue.