Wallace places emphasis on the word "adjust" because he is addressing our realities and way of thinking as "default." He expresses the importance of paying attention to your surroundings, and adjusting to other perspectives and ways of thinking. He compares our ignored experiences to the water fish swim in but were never taught to notice.
Nick means that people can fit into only one of these four categories, which show that no one is truly happy in their lives.
Gatsby and Tom are the pursuing, Daisy is the pursued, Jordan is the busy (too busy to care about anyone else or being a good person), and Nick is tired. He's tired of having to deal with everyone else's drama and problems.
Nobodys perfect, thats the conflict (problem)
The answer is C. I'm sure