The vehicle registration document is compulsory for trailers and semi-trailers...
A)with a MAM not exceeding 750 kg.
B)regardless of their MAM.
C)with a MAM exceeding 750 kg.Correct
The vehicle registration document is the document that authorises the circulation of vehicles. It contains the vehicle's identifying data (registration plate, make, model, intended use, number of seats, MAM, date of registration, holder's details, etc).
It is compulsory for all motor vehicles and for trailers and semi-trailers with a MAM of more than 750 kg.