When a team member is underperforming, the project manager should first assess skill gaps or knowledge barriers. Identifying whether the person needs additional training, mentoring, or support is a fundamental leadership responsibility. This supports the PMBOK principle of fostering individual and team performance. The PMBOK Guide - Seventh Edition emphasizes team development through coaching, mentoring, and training. Adaptive leadership helps align assignments with competency and career development. Option A accepts inefficiency without root cause analysis. Option B may disrupt team focus and doesn't address individual needs. Option C is broader but should come after identifying actual training gaps. References: PMBOK Guide - Seventh Edition, Team Performance Domain PMI Talent Triangle: Leadership & People Skills -