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Expression of IdeasMediumExplaining why tyres have tread

Expression of Ideas practice question

While researching a topic, a student has taken the following notes: - Tyre tread is the pattern of grooves cut into a tyre's surface. - On a wet road, a smooth tyre rides on a thin film of water and loses its grip. - The grooves channel water away from the patch where the tyre meets the road. - This keeps the rubber in contact with the road surface.

The student wants to explain why tyres have tread. Which choice most effectively uses relevant information from the notes to accomplish this goal?

  1. A. Tyres have tread because its grooves channel water away on wet roads, keeping the rubber in contact with the surface instead of riding on a film of water.Correct
  2. B. A smooth tyre loses its grip on a wet road.
  3. C. Tyre tread is a pattern of grooves cut into the tyre.
  4. D. Tread makes a tyre last longer before it wears out.

Answer: A. Tyres have tread because its grooves channel water away on wet roads, keeping the rubber in contact with the surface instead of riding on a film of water.

The goal asks WHY. Choice A gives the mechanism and the problem it prevents.

Why the other answers are wrong

B. A smooth tyre loses its grip on a wet road.
The problem without the solution.
C. Tyre tread is a pattern of grooves cut into the tyre.
A definition, not a reason.
D. Tread makes a tyre last longer before it wears out.
Nothing in the notes concerns wear.

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