From PMI's book "The Standard for Program Management", section 3.5.5 Scope Definition: "The program scope statement becomes the basis for future program decisions and articulates the scope boundaries of the program"

B is correct answer The document that should serve as the baseline for all future program decisions in the program planning processes is the Program Management Plan. This comprehensive document provides a detailed roadmap for how the program will be managed and includes key information that guides decision-making.

B. Program Management Plan. B. Program Management Plan: This is the correct choice. The Program Management Plan is a formal, approved document used to guide both program execution and program control. It integrates and consolidates all of the subsidiary plans and baselines from the planning processes. As such, it serves as the baseline for how decisions are made throughout the program, encompassing scope, time, cost, quality, human resource, communications, risk, procurement, and stakeholder management.

B should be the right answer. From PMI book, it clearly states that the program management plan is therefore a reference document and should be seen as a managed baseline (page 110)

C is a right answer

From PMI's book "The Standard for Program Management", section 3.5.5 Scope Definition: "The program scope statement becomes the basis for future program decisions and articulates the scope boundaries of the program"

"The program management plan is a single, formal, dynamic document that outlines how the program is to be managed, executed, and controlled."..."This document should ensure there are no surprises through execution on how the program is managed or decisions are made." https://uwaterloo.ca/ist-project-management-office/methodologies/program-management/program-benefit-delivery/program-management-plan