Answer: D) They give the actions described a feeling of importance.
Step-by-step explanation: The tone of a poem, a story, or a text in general, is the author's attitude toward the audience, the subject or even the characters of the text. There are many different types of tones: negative, positive, happy, sad, angry, etc. In the given quotation from "Song of Myself" by Walt Whitman, we can see that the words "effuse" and "drift" affect the tone of the line by giving the described actions a feeling of importance.