What characteristic of a positive attitude does Michael display when admitting his mistake to his boss?

Michael displays responsibility by admitting his mistake to his boss, which is a hallmark of a positive attitude. Taking responsibility for one's actions demonstrates accountability and maturity, qualities that contribute to a constructive and collaborative work environment. When an individual acknowledges their errors, it not only fosters trust between them and their supervisors but also encourages open communication and problem-solving.

The other characteristics mentioned—being pleasant and smiling, being interested and enthusiastic, and being uncomplaining—while indicative of a positive attitude, do not directly relate to the act of admitting a mistake. Such an admission requires a higher level of self-awareness and courage, reinforcing the notion that responsible behavior is fundamental to maintaining a positive mindset and improving personal and team dynamics.