In what case may the rider of a motorcycle ride without a helmet?

In what case may the rider of a motorcycle ride without a helmet?
A)In no case, as a helmet is always mandatory.
B)When riding on urban roads at reduced speed.
C)When the motorcycle has a self-protection structure, a seatbelt, and this is recorded on its ITV card.Correct
As a general rule, the rider and passengers of motorcycles must wear an approved protective helmet. Exceptionally, if the motorcycle has a self-protection structure, fitted seatbelts, and this is recorded on the ITV card, the use of a helmet may be dispensed with, and seatbelts must then be worn instead.