The correct option is A thermal pollution
Many industries such as thermal power plants, oil refineries, nuclear power plants use water for cooling their machinery. This hot waste water may be 8∘C−10 ∘C warmer than the water present in the resources. This hot water when released into nearby streams or rivers leads to increase in temperature. This sudden fluctuation in the temperature of water kills the fishes and harms the plant life growing in it, and thus leads to thermal pollution.