Who does Thornton sell Buck to?

In the narrative of "The Call of the Wild," Thornton does not sell Buck to anyone. Instead, he forms a deep bond with Buck and treats him with kindness and respect, which stands in stark contrast to Buck's previous experiences with other owners. Throughout the story, Buck is sold multiple times before he finds Thornton, but once he is with Thornton, their relationship is characterized by loyalty and companionship rather than transactions. This connection emphasizes themes of friendship and the value of trust in the face of adversity, marking a pivotal point in Buck's journey. Therefore, the idea that Thornton sells Buck is inaccurate, making the correct response that he does not sell him to anyone.