The most appropriate response is:
The use of three quatrains gives a consistent, ordered quality to the speaker’s whimsical descriptions of the dream.
This choice effectively highlights how the structure of three quatrains contributes to the overall tone and flow of the poem, allowing the dreamy imagery to unfold in an organized manner that enhances the whimsical nature of the content. The regularity of the quatrains supports the surreal yet serene quality of the dream experience depicted in the poem.