Concept:The word 'Enervate' means to weaken or drain someone's energy, strength, or vitality.Explanation:Enervate describes the action of making someone feel weak or tired. For instance, a long and difficult hike can enervate even the most experienced trekkers. The word 'Exhaust' also means to drain a person mentally, emotionally, or physically until they are extremely fatigued. Therefore, both words share the core idea of loss of strength. In contrast, Strengthen, Revive, and Motivate all have opposite or unrelated meanings—they suggest gaining energy or being encouraged.Answer:Exhaust (Option D)