A supplemental restraint system in vehicles consists of which components?

The correct response highlights that a supplemental restraint system (SRS) primarily consists of airbags and seat belts, which work together to enhance occupant safety during a vehicle collision. Airbags are designed to deploy in the event of a crash to provide a cushion that helps prevent injury to the occupants. Seat belts, on the other hand, are fundamental for holding occupants in place during a collision, thereby preventing them from being ejected from the vehicle or colliding with internal structures.

The synergy between seat belts and airbags is crucial for optimal safety; the seat belt secures the occupant, while the airbag provides additional protection upon impact. This dual system is why it is referred to as a "supplemental" restraint, as it supplements the primary restraint system, which is the seat belt itself.

Other options may include components that focus on different aspects of vehicle safety or injury prevention, but they do not encapsulate the full function of a supplemental restraint system as accurately as the correct choice does. For instance, headrests are essential for preventing whiplash but do not constitute a restraint system. Crumple zones are designed to absorb energy during a collision, providing structural safety but are not part of the restraint system itself. Similarly, stating "only airbags