Is the airbag effective if the vehicle's occupants do not use the seatbelt?

Is the airbag effective if the vehicle's occupants do not use the seatbelt?
A)Yes, but only for the driver.
B)Yes.
C)No, and it can cause serious injuries.Correct
The airbag is a very safe passive safety system but, to avoid adverse effects, we must bear in mind the following: - It is a complement to the seatbelt, so they must always be used together. - It is advisable for the airbag to be approximately 25 cm from the body and never less than 10 cm away. - We should avoid placing objects near the airbag or resting legs on the dashboard. When the airbag deploys, very serious injuries could occur. - When using a rearward-facing child restraint device in a seat with an airbag, we must deactivate it.