Which statement defines a PRINCE2 principle?

The PRINCE2 principle 'Manage by Stages' advocates for planning, monitoring, and controlling a project on a stage-by-stage basis. This provides review and decision points for the Project Board to assess the project's viability at key intervals. It ensures that the project does not proceed without proper authorization at the end of each management stage, which is a fundamental control mechanism within the PRINCE2 methodology.

A. This describes an activity within the Quality theme, which is guided by principles but is not a principle itself.
C. This describes an activity within the Risk theme, which, like quality, is a core aspect but not one of the seven principles.
D. The principle is 'Tailor to suit the project environment', not the competitor's environment, which would be an external factor to consider.

- AXELOS. (2015). PRINCE2 Agile® Guidance. The Stationery Office (TSO). Section 4.4, "The PRINCE2 principles: Manage by stages", p. 27.

- AXELOS. (2015). PRINCE2 Agile® Guidance. The Stationery Office (TSO). Section 4.1, "The seven PRINCE2 principles", p. 25. (Lists all seven principles, confirming B is one and A, C, D are not).