Which safety systems can lose effectiveness if the seatbelt is not fastened?
A)The suspension and shock absorbers.
B)The brakes and ABS.
C)The airbags and headrests.Correct
The airbag and headrests are two very effective safety systems, but if they are not used together with the seatbelt they can be very dangerous. The seatbelt must always be worn, except in certain exceptions.