'Thermal pollution' means dumping heat in an ecological system, like a lake or a pond. Thermal power plants have to throw some heat into a 'sink' because of they:

get overheated

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have special anti-pollution laws

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follow the local sanitation laws

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follow the second natural law of thermodynamics

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Solution

The correct option is B get overheated
Thermal pollution is the degradation of the quality of water due to a sudden change of its temperature. A primary source of thermal pollution is the discharge of heated water from the power plants. The unused heat, generally around $60$ % of the input energy which is unable to be used in the process, is then returned to a sink, such as water.

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