How does Whitman develop these shared topics in the poem

According to The Longman Anthology of Poetry, “Whitman received little public acclaim for his poems during his lifetime for several reasons: this openness regarding sex, his self-presentation as a rough working man, and his stylistic innovations.” A poet who “abandoned the regular meter and rhyme patterns” of his

Explanation:

The dominant themes that are more pervasive in Whitman's poetry are democracy, life/death cycles, individualism, and nature.

third person

explanation:

note the usage of names and pronouns, "james" & "the old man". this alone can confirm it as third person, as first person uses "i" and the like, while second person uses "you" and the like.

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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.