Final answer:
During the Exploration Life Stage, typically defined as adolescence (ages 12-18), the characteristic feature is the development of a realistic self-concept and an exploration of various life opportunities.
Step-by-step explanation:
If in the 4-10 years (Fantasy) of a human being's life needs are dominant and role-playing in fantasy is important, during the Exploration Life Stage, characteristic D is most indicative of this period. Developing a realistic self-concept, and learning more about various opportunities is what typically characterizes the Exploration Life Stage of adolescence. This stage, according to Erikson's psychosocial stages of development, is where children aged 12-18 begin to ask "Who am I?" and "What do I want to do with my life?" leading them to explore different identities and paths until they find one that fits them well.
This stage is key for laying the foundation for future career development and general personal growth.