Concept:Mood is the emotional feeling or atmosphere the poet creates in the poem.Explanation:In Diop's "Vanity", the poet is troubled by the suffering and futile struggles he observes.He expresses this worry through a series of rhetorical questions, but rhetorical questions are only a stylistic device, not the mood itself.The poem does not condemn aggressively; rather, it reveals a sincere emotional involvement.Therefore, the prevailing mood is one of deep concern.Answer:D. concern