The thermal motion means

motion due to heat engine

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disorderly motion of the body as a whole

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motion of the body that generates heat

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random motion of molecules

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Solution

The correct option is D random motion of molecules
Whenever a system absorbs heat from the surroundings or when we supply thermal energy to a system, the internal energy of the system increases. The heat absorbed increases the kinetic energy of the molecules causing them to move randomly.

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