Answer and explanation

Correct answer: A. To hold the vehicle when parked

  1. Step 1: The handbrake keeps a parked vehicle from rolling, especially on a slope.
  2. Step 2: It also helps in emergency.
Answer
To hold the vehicle when parked.
Why not the others: To slow the car on motorways, to switch on the brake lights only and to cool the tyres after a trip don't fit.

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