In a situation where there is a disagreement about the development approach, the project manager should promote informed decision-making. Reviewing lessons learned from previous similar projects can provide evidence-based guidance. This also helps balance opinions and encourages collaboration and consensus, which is consistent with team empowerment and stakeholder collaboration. PMBOK Guide - Seventh Edition and Agile Practice Guide both recommend using lessons learned and knowledge management to guide decisions and improve outcomes. Option A is directive and ignores team input. Option B is vague and does not resolve the issue. Option D may be helpful but skips team collaboration and lessons learned. References: PMBOK Guide - Seventh Edition, Team Performance and Tailoring Domains PMI Knowledge Management Practice Framework ##############################################