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.
A citation in parentheses
The correct answer is A. Subjective narrator.
When a narrator is subjective, this one expresses or adopts the point of view of a specific character in the story. He usually knows what the character feels or think, but not what the other characters maybe thinking or doing. He has a limited vision of what is occurring in the story.
The answer is D.
A citation looks like this
"My name is DC" (Me, 0)