A person who is more interested in himself rather than anything that is going on around him

Answer: Option C

One word substitute is Introvert.

Egoist: a self-centered or selfish person.
Extrovert: an outgoing, socially confident person.
Introvert: a person predominantly concerned with their own thoughts and feelings rather than with external things.
Eccentric: (of a person or their behaviour) unconventional and slightly strange.