Answer and explanation

Correct answer: C. To cushion the occupant in a crash, in addition to the seat belt

  1. Step 1: An airbag is a supplementary restraint, which works best when the occupant also wears a seat belt.
Answer
To cushion the occupant in a crash, in addition to the seat belt.
Why not the others: To replace the seat belt, To make the car accelerate faster and To warn about low tyre pressure don't fit.

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