The quote "the world is made up of two classes - the hunters and the huntees" primarily reflects Rainsford's realization about his own nature. After being hunted on Ship-Trap Island, he comes to understand the dynamics of predator and prey, which leads to a deeper insight into his own identity as both a hunter and, ultimately, a hunted individual. This realization is central to the themes of empathy, survival, and the ethics of hunting, making it a pivotal moment in the story.
While the other options touch on relevant themes, they are not the primary focus of this particular quote.