When performing the occasional carriage of passengers, what document must you present for inspection by the competent persons upon demand?

The correct documents to present for inspection during occasional carriage of passengers are the registration certificate Part I and the approval for the occasional carriage of passengers.

The registration certificate Part I serves as proof that the vehicle is legally registered and roadworthy. The approval for occasional carriage indicates that the vehicle meets the necessary safety and operational standards for carrying passengers. This combination is crucial for ensuring passenger safety and compliance with German traffic regulations, as it provides assurance that the vehicle and its service have been officially sanctioned.

Without these documents, you could face penalties or legal issues during inspections, as the authorities need to verify the legitimacy of the passenger transport.