Answer:
A) air should be let out of a tire when it is hot.
Explanation:
If the temperature of the tire increases, the air pressure on the tire will do the same, so, if the tire has a "cold pressure" that is adequate, then when the temperature rises, the pressure will do the same, therefore, when the temperature drops again, the pressure will do the same, so if you let air out when the temperature rises, when the temperature drops again you will have less pressure, which is not recommended.