Answer: C. It uses gaps between words to guide the reader.
Explanation: The author manipulates the gaps between words as a literary resource in this poem to further illustrate the poem's meaning. The long gaps between "whistle," "far" and "and wee" help convey the feeling of children hearing the balloon seller's blowing his whistle from a distance, without hurry, just to have the gaps become shorter again in the next line, creating a contrast with the children who run toward him.
