Which of the following is a primary restraint system?

• A. Headrests
• B. Airbags
• C. Seat Belts
• D. Seat Cushions

Answer: (C)

The main idea here is how restraint systems are categorized: which device actually controls the occupant’s movement during a crash versus which ones assist or cushion after movement is already restrained. The best choice is the seat belt because it serves as the primary restraint—its job is to secure the occupant and limit forward motion, keeping them in the seat and reducing the risk of injury or ejection. Airbags are a supplemental restraint system that cushions the body once the belt has restrained motion and the crash has begun, but they don’t prevent forward movement on their own. Headrests protect the neck by limiting whiplash during rear-end impacts, not by restraining forward motion, and seat cushions are for comfort and support rather than restraint. So the primary restraint system is the seat belt.