Concept:Non-renewable energy sources are those that can be used up and are not continuously replenished by nature.Explanation:The Sun, waves, and wind are constantly renewed and available again and again.Wood comes from trees, which take a long time to grow and can become exhausted.In this comparison, wood is the only source that can be depleted if not replaced.Therefore, wood is considered the non-renewable source of energy among the options.Answer:D. Wood