Which Individual with a Genetic Predisposition Toward Being Extroverted Is

Multiple Choice

Which individual with a genetic predisposition toward being extroverted is demonstrating successful niche-picking?

A) Rick, who is a game show host
B) Wilbur, who is a horse trainer
C) Sebastian, who is a hermit who lives in a cave by himself
D) Dexter, who spends a lot of time studying in the library