In the event of an accident, when the seatbelt has slack despite being fastened...
A)nothing will happen, since the important thing is to have it fastened.
B)it will not affect its effectiveness if it is positioned correctly.
C)a greater distance will be travelled and it is possible to impact against the steering wheel or the windscreen.Correct
If the seatbelt is not properly adjusted and has slack, the body will travel a greater distance before being restrained by the belt, and may impact against the steering wheel or the windscreen.