Which of the following is NOT characteristic of serious and persistent mental illness?

The correct answer identifies a characteristic that is not associated with serious and persistent mental illness. Serious and persistent mental illnesses are characterized by their long-term nature and significant impact on an individual's life. These conditions typically require ongoing treatment and support (option A) because they are not easily resolved and may persist for a long period.

Additionally, individuals with serious mental illnesses often experience a degree of severity that impairs their daily functioning (option B), leading to substantial challenges in managing everyday activities and responsibilities (option D). In contrast, short-lived and easily overcome issues do not align with the nature of serious and persistent mental illnesses, which usually involve complex, enduring challenges that affect a person's ability to function effectively in society. This is why identifying option C as the answer is accurate.