Releasing dirty water into a river increases which problem?

Correct answer: Water pollution

The correct answer is A: water pollution. When untreated sewage, chemicals, waste or harmful microorganisms enter a river, they change the quality of the water. The polluted water may harm fish and other aquatic organisms and may become unsafe for people who use the river. Therefore, releasing dirty water directly increases water pollution. B, rainwater harvesting, means collecting rainwater for later use; it is a conservation method, not the damage caused here. C, energy conservation, means reducing unnecessary energy use. D, tree plantation, means growing trees. Both can help the environment, but neither names the problem caused by dirty water entering a river. Memory cue: dirty water entering water bodies means water pollution.