Answer:
The answer is C. Self-centered.
Step-by-step explanation:
In the sentence My brother is so narcissistic that he keeps his own picture on his dresser. The word narcissistic means self-centered. A person that is self-centered is somebody that is arrogant and seeks excesive admiration and attention. According to this definition of narcissism, the option C is the only one that makes sense with the sentence.