What literary device is used when an author makes subtle references to something well-known?

The correct answer is allusion because it refers specifically to the literary device where an author makes indirect references to a person, event, or work that is widely recognized in culture. This can enhance the texture of a text by allowing readers to connect the new material with the referenced content, providing deeper meaning and resonance within the narrative.

For instance, if an author mentions a character's struggle by comparing it to the trials of Hercules, they are employing an allusion to Greek mythology, which may evoke themes of strength and perseverance for the reader.

In contrast, the other options do not fit the definition of making subtle references to something well-known. An example is a specific instance or illustration of a broader concept, while narrative deals with the structure and storytelling rather than reference. Symbolism involves using symbols to signify ideas and qualities, which diverges from the idea of indirect references to well-known subjects.