Which excerpt from The Call of the Wild shows how the third-person-omniscient point of view provides readers with a historical context for the story?

“The driver was perplexed. His comrades talked of how a dog could break its heart through being denied the work that killed it, and recalled instances they had known where dogs, too old for the toil, or injured, had died because they were cut out of the traces.”
“In less than five months they had travelled twenty-five hundred miles, during the last eighteen hundred of which they had had but five days’ rest. When they arrived at Skaguay they were apparently on their last legs.”
“But so many were the men who had rushed into the Klondike, and so many were the sweethearts, wives, and kin that had not rushed in, that the congested mail was taking on Alpine proportions; also, there were official orders.”
“Four times he had covered the distance between Salt Water and Dawson, and the knowledge that, jaded and tired, he was facing the same trail once more, made him bitter. His heart was not in the work, nor was the heart of any dog.”