The correct answer is: A. Egoist.
An egoist is a person who is excessively concerned with their own interests and well-being. They may be self-centered, arrogant, and narcissistic. Egoists often have difficulty forming and maintaining relationships, as they are more interested in taking than giving.
An extrovert is a person who is energized by social interaction. They are often outgoing, friendly, and talkative. Extroverts tend to enjoy being around people and thrive in social situations.
An introvert is a person who is energized by solitude. They are often quiet, reserved, and thoughtful. Introverts tend to prefer spending time alone or in small groups of close friends.
An eccentric is a person who is unconventional or unusual in their behavior or appearance. Eccentrics may be seen as strange or odd by others, but they often have unique insights and perspectives.
In the context of the question, the only option that describes a person who is more interested in himself rather than anything that is going on around him is egoist.