Final answer:
The literary element best illustrated by the phrase "overcoming adversity" is the theme.
Step-by-step explanation:
The literary element best illustrated by the phrase "overcoming adversity" is the theme. Theme refers to the underlying message or central idea of a literary work. In this case, the phrase suggests that the story is focused on characters facing and triumphing over challenges or obstacles. For example, a story with this theme might feature a protagonist who confronts difficult situations and learns valuable lessons from their experiences.
Learn more about Theme in literature