What literary device is predominantly used by Walt Whitman in his poetry?

Walt Whitman is renowned for his innovative use of free verse in his poetry, which is one of his defining characteristics. This form breaks away from traditional poetic meter and rhyme schemes, allowing for a more natural flow of language that mirrors the rhythms of speech. Free verse gives Whitman the freedom to explore a wide array of themes and subjects, employing an expansive, inclusive style that embodies his belief in democracy and the individuality of the human experience.

This approach allows him to craft long, sprawling lines that enhance the emotional and philosophical depth of his work. For example, in "Leaves of Grass," Whitman uses free verse to create a sense of liberation and spontaneity, reflecting his vision of a more open, democratic society.

The other options relate to poetic techniques but do not capture the essence of Whitman's distinctive style. Metaphor certainly features in his work but is not the primary device; instead, it serves as a tool within his free-verse framework. Iambic pentameter is a traditional meter predominantly used by many poets, but Whitman intentionally chose to step away from such fixed structures. Dialogue is another literary technique that he may use but is not a defining characteristic of his poetry. Overall, free verse is central to the innovation