When may Traffic Authority officers proceed to immobilise a motorcycle?

A)When the passenger is travelling without a helmet.
B)Under no circumstances.
C)When the driver is not wearing a helmet.Correct
Drivers and passengers of motorcycles or motorcycles with sidecars, three-wheeled vehicles and quadricycles, mopeds and special quad vehicles must properly use approved or certified protective helmets in accordance with current legislation, when travelling on both urban and interurban roads. The driver not wearing a helmet means that Traffic Authority officers may proceed to immobilise the motorcycle, as its use is mandatory. However, a passenger not wearing a helmet may dismount from the motorcycle and continue travelling on foot.