Final answer:
Celebrating personal achievements boosts self-esteem by affirming one's confidence and success, thus enhancing self-concept and belief in oneself.
Step-by-step explanation:
The situation that would be likely to boost your self-esteem is c) Celebrating personal achievements. Self-esteem is your level of confidence in your own abilities and worth as a person. Celebrating your own achievements can help you recognize your value and successes, which contributes to a positive self-concept and reinforces your believing in yourself. Comparisons with others, setting unrealistic goals, and seeking constant approval, on the other hand, can lead to feelings of inadequacy and a lower sense of self-worth.