What happens to the sled team during their journey with John Thornton?

During their journey with John Thornton, the sled team endures harsh conditions and significant challenges. This answer reflects the reality of their experiences as they navigate through the brutal elements of the Yukon wilderness. The team faces the extreme cold, difficult terrain, and the demands of hauling heavy loads. These challenges test not only their physical limits but also their resilience and adaptability in such a harsh environment.

The other options suggest outcomes that do not align with the narrative. The sled team does not complete their journey without issues, as they are constantly confronted by the trials of nature. They are also not abandoned by their owners, since Thornton shows care and dedication to the dogs. Additionally, while the lure of treasure is a theme in the book, the sled team does not stumble upon hidden riches during their journey. Instead, the focus remains on survival and the bond that develops between Thornton and the sled dogs, making the choice about enduring challenges the most accurate reflection of their experience.