Which of the following words best describes the tone of the poem?

malicious

reverent

urbane

argumentative

reverent would be my guess. and or urbane on that matter ...

I think it will be reverent b cause it means respectful, worshiping and worshipful. and here the poet or the speaker is doing a type of request to the swan. so it would be reverent. for telly u can also check on google. ok