Answer this please

Dear student, A lake rich in domestic waste nutrients will lead to eutrophication. Eutrophication means nutrient enrichment and it is due presence of excess nutrients in water bodies. Release of nutrient rich sewage and industrial effluents lead to introduction of nutrients such as nitrogen and phosphorus in the water body. This leads to the increase in temperature and Biological Oxygen Demand of the water body, causing increased biological activity, thereby leading to algal blooms. It deoxygenate the water enough to kill the fish and other animals. Therefore, the correct answer is option C. Thanks and regards