Rainsford does not hold human life on the same level as animal life. For Rainsford hunting is a sport or a means to gain food, not a mere even to simply kill for the love of killing.
Zaroff's ideas counter this in that Zaroff has progressed to the point where killing humans, the most intelligent beings, has become a sport to him.
The bottom line is that the two men have different world views which influence their actions.
I think it might be C.Third stage: nature viewed as a type of divine presence In my opinion if you as me, Nature is a divine presence, being able to see and learn so many new things.
