Must the passenger of a motorcycle wear the helmet fastened?
A)Yes, and furthermore the driver is responsible for ensuring it is fastened.Correct
B)Yes, with the passenger being the only one responsible.
C)It is not mandatory, but it is advisable.
The helmet must fit well on the head, must not be worn tilted backwards or forwards over the eyes, and the safety strap must be worn fastened.
The driver is responsible for ensuring that the vehicle's passenger adopts all mandatory safety measures.
In this case it is the driver's responsibility that the passenger wears the helmet correctly fastened.