Final answer:
8-year-old Natalie is in Eli Ginzberg's fantasy period of career development, as her aspiration to be a flying trapeze artist is idealistic and not yet influenced by practical considerations.
Step-by-step explanation:
When 8-year-old Natalie expresses her desire to become a flying trapeze artist after her first circus visit, according to Eli Ginzberg's theory, she is in the fantasy period of career development. This period is characterized by children's choices being influenced by whims and attractions, without the constraints of reality such as skills, educational requirements, or job availability. The fantasy period typically occurs up to age 11 and is marked by idealistic and often unrealistic career aspirations, much like Natalie's newfound dream of being a trapeze artist.