How does the contrast between civilized life and wilderness serve the narrative?

The correct choice emphasizes the theme of the struggle between nature and nurture, which is central to the narrative of "The Call of the Wild." Throughout the story, the protagonist Buck is initially a domesticated dog living a comfortable life in California but is eventually thrust into the harsh realities of the wilderness.

This transition illustrates how Buck's inherent instincts and primal instincts emerge as he adapts to the challenges of his new environment. The contrast between his civilized upbringing and the ruthless demands of the wild highlights the innate qualities that surface when survival is at stake. The narrative explores how Buck's character evolves as he navigates the conflict between the learned behaviors of a domesticated pet and the primal calls of the wilderness that resonate within him. This conflict raises questions about identity and what it means to return to one's true nature, making the struggle between nature and nurture a powerful driving force in the story.

By examining this contrast, readers gain insight into Buck's transformation and how the forces of nature shape his identity, ultimately aligning with the theme of the struggle between civilization and the wild.