Answer and explanation

Correct answer: A. Less friction between tyres and surface

  1. Step 1: Wet surfaces reduce grip, so the car needs longer to stop.
  2. Step 2: Speed should be reduced.
Answer
Less friction between tyres and surface.
Why not the others: The engine is colder on wet roads at night, the brake pads are wetter in the rain and the driver always reacts slower in the rain don't fit.

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