Comprehensive and Detailed Thebusiness sponsoris responsible forapproving changesbefore implementation, as they have decision-making authority over business objectives, funding, and risks. BABOK Guide (Chapter 5.5 - Assess Requirements Changes)states that approval authority typically resides withbusiness stakeholders who have the authority to make investment and prioritization decisions. Subject matter experts (Option B)provide insights but do not approve changes. Project managers (Option C)oversee execution but do not authorize scope changes. System architects (Option D)provide technical expertise but do not make final approval decisions.