Why does a flare during an autorotation generate higher rotor RPM?

Question

Question PPL(H) - Private Pilot License - Principles of Flight (Helicopter)

QuizVDS · Accepted Answer

The vertical airflow through the rotor disc increases

QuizVDS · Answer

The pitch angle increases

QuizVDS · Answer

The tangential force tilts backwards

QuizVDS · Answer

The ground effect leads to better performance

Id 721 - PPL(H) EN - Why does a flare during an autorotation generate higher rotor RPM?