Which narrative element involves the rising tensions leading to the story's peak?

Rising Action is the narrative element that encompasses the series of events and conflicts that build tension and develop the plot leading up to the story's climax. During this phase, characters face various challenges and obstacles, which create suspense and anticipation for what will happen next. It's an essential part of storytelling, as it establishes the stakes and engages the reader, compelling them to continue reading to see how the conflicts will be resolved.

In the context of "The Call of the Wild," the rising action would involve Buck's transformation from a domestic pet to a wild animal, detailing his struggles and experiences that fuel the narrative until it reaches its peak. This not only deepens the reader's investment in Buck's journey but also highlights the central themes of survival and the return to primal instincts.