Which option is a correct measure for lake conservation?

Correct answer: Not dumping waste into the lake

Direct answer: Option A is correct. Lake conservation means protecting the lake’s water, surroundings, plants and animals from pollution and damage. Not dumping waste is a direct and effective measure because plastic, sewage and other rubbish can pollute water, harm aquatic life, block natural flow and make the lake unsafe. Option A therefore supports clean and healthy lake conditions. Option B is wrong because increasing plastic increases pollution and can injure animals. Option C is wrong because releasing a dirty drain directly introduces sewage and harmful substances into the lake. Option D is wrong because blocking all water flow can disturb the lake’s natural water balance and may cause stagnation, flooding or drying; conservation requires planned management, not an absolute blockage. The best basic action in this list is to prevent waste from entering. Other conservation steps may include treating wastewater, planting vegetation around the lake and controlling encroachment, but they do not change the answer. Exam cue: clean water and no dumping are simple signs of conservation.