You would expect to find thermal pollution near a power plant. Thermal pollution is the increase in water or air temperature in a natural environment, caused by human activities such as industrial or power generation processes. Power plants require a large amount of energy to operate, and they often use water as a coolant, which is subsequently discharged back into nearby waterways at a higher temperature. This discharge of heated water can cause thermal pollution, which can have negative impacts on aquatic ecosystems and the organisms that depend on them. Therefore, option C, near a power plant, is the correct answer.