In most cases, management of the enterprise is the responsibility of:

A. the project management office.

B. the executive management team.

C. the board of directors.

Explanation:
A strategic (enterprise) PMO (sometimes called the office of strategy management) plays a role in linking the organization’s projects to its strategic plans.
Reference: https://www.pmi.org/learning/library/strategic-project-management-office-execution-6737