The accurate analysis of the prosody and graphic elements used in the poem "Longing" by Paul Laurence Dunbar is:
The lines are close to the same length, contributing to a steady rhythm and even appearance on the page.
This choice reflects the poem's consistent structure, which helps create a sense of balance and rhythm throughout the verses. The other options may contain elements of truth but do not capture the primary effect of the poem's prosody and graphic presentation as effectively as this one.