ACMP emphasizes thecriticality of sponsorship. If leadership is absent or unclear about their responsibilities, the change manager must create or refine asponsorship plan. This plan specifies sponsor roles, required visible behaviors, engagement activities, and alignment with stakeholders. Communications and resource plans address supporting activities, but they cannot substitute for active leadership. Without a sponsorship plan, resistance increases, employees lack direction, and adoption falters. Therefore, the most direct remedy to leadership absence is option D.

(Reference: ACMP Standard, Process Group 2 – Sponsorship Strategy and Plan; Activities: Define sponsor role, create plan for engagement and visibility, coach leaders.)