What is the purpose of the grooves in the tread pattern?

En español: ¿Para qué sirven las ranuras del dibujo de la banda de rodadura?

A Only to decorate the tyre
B To expel water and improve grip Correct answer
C To make the tyre heavier
D To increase fuel consumption

Why this is the correct answer

The tread grooves prevent overheating, make the tyre more flexible, improve grip, and above all expel water from the road when it rains.

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