Concept:The poem reflects on death as something that cannot be reversed by nature or life-giving forces.Explanation:The speaker recalls how the sun used to wake the soldier gently, even in France. This morning, however, the sun cannot rouse him because he is dead. The poem questions whether all the effort of creating life was worthwhile if death must finally overcome it. This idea points to the meaninglessness or vanity of human effort in the face of inevitable death. Therefore, the central theme is the futility of life.Answer:D. futility of life