A bus route permit regulates:
- Only the route in which the bus is listed.
- Only the fare of the route service.
- Correct answer: The service on that route.
- The details and size of the bus.
Why this is the answer
The correct answer in the official bank: The service on that route.
A route permit regulates the service on the whole route, not just one detail of it, such as the fare or the route. Therefore, the answers that begin with the word "only" are too partial. The permit is issued to the public transport operator and defines how the service is provided to the public on the route, such as the route, the stops and the operating hours.