Which of the following may prompt a feeling of 'compunction'?

The term 'compunction' refers to a sense of guilt or moral scruple that follows the feeling of having done something wrong. This emotion typically arises when individuals reflect on actions that go against their ethical standards or values. Therefore, making a mistake or wrongdoing naturally evokes feelings of regret or remorse, leading to compunction.

In contrast, winning a competition, achieving a lifelong goal, or celebrating a success generally evoke positive feelings and emotions, as they are associated with accomplishments and achievements rather than any sense of guilt or regret. Thus, these options do not connect to the definition of compunction, making the second option the one that appropriately represents the feeling described.