During a warm day, a driver measures the air pressure in a car tyre. Later, when night falls and the temperature falls, the pressure of the air inside the tyre falls as well. The tyre has no air leaks. Why does the pressure fall?
- AThe air molecules in the tyre move more slowly.
- BThe air molecules in the tyre stop moving.
- CThe volume of the air in the tyre decreases.
- DThe volume of the air in the tyre increases.