AXELOS. (2020). Managing Successful Programmes (MSP) 5th Edition. TSO (The Stationery Office).
Section 3.3, Lead with purpose: "Programmes are driven by a clear vision of a better future... The vision provides an inspirational picture of the future state..."
Section 5.2, Design: "The purpose of the Design theme is to design the future state of the organization... The key output from this theme is the target operating model (TOM)... The TOM provides a tangible representation of the vision..."
Table 3.1, How the principles are applied by the themes: For the intersection of the 'Lead with purpose' principle and the 'Design' theme, the manual explicitly states: "Maintaining an inspirational picture of the future state, supported by the target operating model." This directly validates option B.