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Question:

Letting the air out of hot tires ____.

A is a bad idea because when the tires cool off, the pressure will be too low.
Explaination

When tires get hot, the air pressure increases. However, relieving that extra pressure will leave the air pressure too low when the tires cool again, and then the tires may catch fire or blow out. If your tires are too hot to touch, stop until they have cooled down.

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