Character Analysis of Marco

In an excerpt from a literary novel, the character Marco is introduced while he is having a conversation with his younger sister in the living room.

Marco's responses are often sarcastic, and he speaks in a rapid manner, barely allowing his sister to interject. His expressions range from amusement to mild annoyance. When his sister mentions a goal she wants to achieve, Marco dismisses her dreams as unrealistic, yet he occasionally reveals a fragile side when discussing his own failures.

Based on this characterization, which of the following options best identifies Marco's primary personality trait?