What does enthusiasm reflect in a person's duty performance?

Enthusiasm in a person's duty performance signifies a sincere interest and exuberance for their responsibilities. When someone approaches their duties with enthusiasm, it demonstrates an intrinsic motivation and positive attitude towards the tasks at hand. This level of engagement can enhance not only the individual's performance but also inspire those around them. Enthusiastic individuals are typically more committed to achieving goals and contributing to team dynamics, fostering an environment of morale and productivity.

In contrast, options relating to indifference, desire for promotion, or selfishness do not capture the essence of enthusiasm. Indifference implies a lack of care or interest in work, while a desire for promotion may stem from ambition but does not necessarily reflect the passionate engagement that comes with true enthusiasm. Similarly, selfishness is counterproductive to teamwork, which is contrary to the collaborative spirit that enthusiasm promotes. Thus, the correct answer highlights the positive impact of genuine interest and energy in one's performance.