Why does a blacksmith heat the metal rim to fix it on a cartwheel?

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When the blacksmith heats the metal, the size of the metal increases and it is heated to such an extent that it fits the rim of the cartwheel. This cooling acquires the shape of the cartwheel and is safe for use.

When the blacksmith cools the metal, the size of the metal increases and it is cooled to such an extent that it fits the rim of the cartwheel. This heating acquires the shape of the cartwheel and is safe for use.

When the blacksmith refrigerates the metal, the size of the metal decreases and it is cooled to such an extent that it does not fit the rim of the cartwheel. This cooling acquires the shape of the cartwheel and is not safe for use.

None of these

answer is A.

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Detailed Solution

Blacksmith heats the metal rim to fix it on a cartwheel because by heating the metal, the size of the metal increases and it is heated to such an extent that it fits the rim of the cartwheel. When it cools, it acquires the shape of the cartwheel and is safe for use.

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