When a key executive expresses concerns about project success, especially regarding costs, the project manager must seek to understand the concern directly. A one-on-one meeting with the CFO enables the project manager to gather details, clarify any misunderstandings, and explore potential solutions or adjustments. The PMBOK Guide - Seventh Edition highlights stakeholder engagement and communication as critical success factors. Engaging stakeholders individually promotes trust and effective issue resolution. Option B is premature without understanding the specifics of the CFO's concern. Option C is useful but may not address the CFO's immediate concerns. Option D could come across as dismissive if concerns are not first acknowledged. Reference: PMBOK Guide - Seventh Edition, Stakeholder Performance Domain PMI's Principles of Effective Stakeholder Communication -