Final answer:
Each stanza of Walt Whitman's poem in the question provided consists of four lines, which corresponds with the common stanzaic form known as a quatrain. The correct answer is option D.
Step-by-step explanation:
The question 'How many lines are in each stanza of Whitman's poem?' can be answered by looking at the structure of his poems. While the number of lines per stanza can vary in poetry, the stanza provided in the question is from Walt Whitman's work and consists of four lines. Therefore, the answer is D. 4.
Walt Whitman is known for his use of free verse, which does not adhere to a strict stanzaic form or meter, often giving his poetry an organic and natural flow. However, in his poem, he employs a stanza that has four lines. This is similar to a quatrain, which is the most common stanzaic form in English poetry and typically has a rhyme scheme. Despite Whitman's general avoidance of traditional forms, here he does use a stanza that corresponds to this common structure.