Final answer:
Ellie, who is 15, has been claimed as a dependent which indicates that a parent or guardian is responsible for her and includes her in their tax forms.
Step-by-step explanation:
Considering the information provided, if Ellie is 15 and has been claimed as a dependent on someone else's tax return, the status of Ellie's dependency can be determined from the options given. The correct option is (2) Ellie is claimed as a dependent. This status indicates that someone else, usually a parent or guardian, has taken responsibility for Ellie financially and legally, and they have listed her as a dependent on their tax forms.