The project manager should address the issue directly and promptly with the team member involved. One-on- one dialogue helps reset behavioral expectations and maintains professional conduct when dealing with customers. It also shows leadership and reinforces team norms.
Option A may be necessary later but may embarrass the individual if done publicly.
Option C may show empathy but avoids addressing the issue.
Option D is too broad and doesn't directly resolve the immediate behavior.
References:
PMBOK Guide - Seventh Edition, Team Performance and Stakeholder Engagement Domains PMI Code of Ethics and Professional Conduct (Responsibility and Respect)