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Which one of the following most accurately conforms to the principle above?

  1. Strengthen PR

  2. Must PR

  3. Cannot PR

  4. Clarify PR

The correct answer is: Must PR

The principle in the question is related to a necessary condition. In logic, a necessary condition means that if the necessary condition is not met, the sufficient condition cannot be met. In this context, "Must PR" accurately reflects this relationship. It indicates that PR is a requirement for something else to happen or be true, aligning with the principle discussed. Therefore, option B is the most fitting choice that conforms to the principle presented in the question.