Final answer:
Older adults are most likely to remember experiences from early adulthood due to the reminiscence bump, where formative and emotionally significant events are better remembered. Therefore, the correct option is D. Early adulthood.
Step-by-step explanation:
Regarding autobiographical memory, older adults are more likely to remember experiences from D. Early adulthood. Autobiographical memory refers to a person's memory of specific events in their life, typically including emotional, social, and contextual details.
Research into memory and aging has found that there is a tendency for older adults to have a reminiscence bump, where they recall more personal events from adolescence and early adulthood, potentially because these are formative years with many first-time and emotionally charged experiences.