Final answer:
Hyperthymesia is characterized by exceptional memory for personal experiences, allowing individuals to recall detailed autobiographical information.
Step-by-step explanation:
A characteristic of Hyperthymesia, also known as Highly Superior Autobiographical Memory, is C) Exceptional memory for personal experiences. Individuals with Hyperthymesia have the rare ability to recall the vast majority of personal experiences and events in their lives in incredible detail. Unlike typical memory capacity, where most people might struggle to remember what they wore or ate on a specific date years ago, those with Hyperthymesia, such as actress Marilu Henner, can remember such details with ease. This extraordinary memory usually becomes evident in adolescence, and to date, there are very few people identified with this condition.