If the client has already approved a change through a formal project order amendment, the project manager must initiate re-planning with the new scope. This aligns with adaptive and traditional approaches where major scope changes require updates to planning documents.
Option A delays necessary rework.
Option C addresses risk mitigation, but re-planning must begin first.
Option D is unnecessary because the client has already accepted the amendment.
References:
PMBOK Guide - Seventh Edition, Planning and Delivery Performance Domains PMI Change Management Guidelines