Answer: B) Life in the wilderness is a constant struggle against death.
We have evidence of this by the passage (third paragraph)
"On the sled, in the box, lay a third man whose toil was over, --a man whom the Wild had conquered and beaten down until he would never move nor struggle again. It is not the way of the Wild to like movement. Life is an offence to it, for life is movement; and the Wild aims always to destroy movement."
It basically says that the Wild aims to destroy life just due to its destructive, cruel, and cold nature. Unfortunately the man in the box is one example of this where it appears he is dead and his two other friends are possibly carrying his body back to town with the aid of the sled dogs.
The portion "It is not the way of the Wild to like movement" is basically the same as the author saying "It is not the way of the Wild to like life" since the author states that "life is movement". In my opinion, movement isn't just simple locomotion, but it could also apply to more general types of movements that all life possesses (so you could apply this logic to plants as well in some fashion).