The third-person omniscient point of view in "The Call of the Wild" primarily allows readers to see into the thoughts and feelings of multiple characters, not just Buck. This perspective provides a broader understanding of the various motivations, emotions, and inner conflicts that different characters experience throughout the story. Therefore, the correct answer is:
It shows readers what different characters think and feel.
This perspective enriches the narrative by presenting a more complex view of the other sled dogs, their owners, and the harsh environment they navigate, which could not be fully explored through a first-person or third-person limited point of view.