In addition to using anaphora, the repetition of words at the beginning of lines in a series, how does Whitman incorporate song into many of his poems? A. He regularly uses onomatopoeia in his poems.
B. He includes sheet music along with his poetry in Leaves of Grass.
C. He uses fixed rhyme schemes and meter.
D. He includes the word “song” or “sing” in many of his titles.

I think its A or B

Explanation:

Sorry if its wrong:(

"fire and ice" is one of robert frost's most popular poems. it was published in december 1920 in harper's magazine and in 1923 in his pulitzer prize−winning book new hampshire. it discusses the end of the world, likening the elemental force of fire with the emotion of desire, and ice with hate.

c. the power of desire is greater than the power of hate.

i believe it is the first choice (1.)

because the major theme is(“both the wild and civilization have rules.”)

and also as u said,( based on what buck learns within the call of the wild, "both the wild and civilization have rules".this is true of humans within society as well.