According to the PMBOK® Guide, the Project Sponsor is the person or group who provides resources and support for the project and is accountable for enabling success.

Role in Initiation: The process of Develop Project Charter is the official start of a project. While the Project Manager often assists in drafting the charter, it is the Sponsor who is responsible for formally initiating the project. They do this by signing the charter, which provides the project manager with the authority to apply organizational resources to project activities.

Business Justification: The sponsor is typically the one who ensures the project is aligned with the organization ' s strategic goals and remains " sold " on the business case throughout the project ' s life cycle.

Authority: Because the sponsor is usually a high-level executive or a representative of the customer/organization, they have the financial and political authority to authorize the project ' s existence.

Analysis of Other Options:

B. Project manager: The PM is often assigned during the initiation phase (ideally during the creation of the charter), but they do not have the authority to " initiate " or " authorize " the project themselves. Their role is to lead the team and manage the work once authorized.

C. Program manager: A program manager manages a group of related projects. While they may oversee multiple project managers, the specific accountability for the authorization and funding of an individual project lies with the Sponsor.

D. Project management office (PMO): A PMO provides standardizing and support functions. While a PMO might facilitate the selection process or provide the template for the charter, the " responsibility " for triggering the project ' s start rests with the Sponsor.