In the context of phase gate reviews mandated by a program governance board, where each component project is reviewed and authorized to proceed to the next phase, and tracking and reporting of actual benefits realized is one part of the review, the other part of the review should be:
C. **Demonstrating that other stage gate requirements have been met.**
This involves showing that the project has met the specific criteria or requirements set for moving from one phase to the next in the project lifecycle. These requirements often include aspects like project performance, risk management, compliance with standards, and alignment with overall program objectives.