Concept:Waste disposal should protect health and the environment and save resources.Solution:Dumping causes filth, bad smell and breeding of flies and mosquitoes.Burning pollutes the air with smoke and harmful gases.Burying can pollute soil and underground water.Recycling turns waste such as plastics, paper and metals into new products, so it reduces pollution and saves raw materials. It is the best method.Answer:Option D (recycling)