About B licence: three limits at once: which statement is correct?

The minimum age for category B is 18. 2toDrive is supervised driving from age 17, not independent authorisation.

The mass, passenger and trailer limits of a B licence belong to the rules on licences with a restrictive code (e.g. for medical aids).

With a B licence you may drive a vehicle for any number of passengers, as long as the mass stays under 3,500 kg.

With a B licence you may tow any trailer, as long as the trailer itself is not overloaded.

Explanation

trap: supervised-is-independent. The minimum age for category B is 18. 2toDrive is supervised driving from age 17, not independent authorisation