Final answer:
option D. White Fang had seen other camp dogs working in harnesses and understood what was expected of him, indicating he was familiar with the situation.
Step-by-step explanation:
From the paragraph presented, we can infer about White Fang that he has witnessed other dogs wearing harnesses and pulling sleds. The fact that White Fang did not resent the harness much, suggests that he was familiar with the sight of camp-dogs working and understood what was expected of him. There is no mention of the sled's size, his desire to prove worth, or admiration to be like the other sled dogs, which rules out options A, B, and C.