Walt Whitman chose a free verse structure for 'Song of Myself' because it allowed for the expression of expansive ideas. This choice reflects his exploration of self and the interconnectedness of humanity without the limitations of traditional rhyme and meter. Therefore, the best answer is D: Free verse allowed for the expression of expansive ideas.
;
Walt Whitman used a free verse structure in "Song of Myself" to allow for the expression of expansive ideas, matching the poem's themes of freedom and interconnectedness. This structure provides flexibility, enabling a more natural flow that reflects the complexity of human experiences. It emphasizes Whitman's exploration of self within the broader context of society and nature. ;