Which of the following definitions best describes an allusion's contribution to a text?

The definition highlighting that an allusion establishes connections to the audience's knowledge is particularly insightful because allusions often reference well-known events, literary works, historical figures, or cultural elements that enrich the text. By invoking these references, an author taps into the audience's pre-existing understanding and emotional responses, thereby adding deeper layers of meaning to the narrative or argument being presented.

Allusions effectively invite readers to make connections between the text and their own experiences or knowledge, enhancing their engagement and interpretation of the work. This interaction can lead to a more profound appreciation of themes or highlighting contrasts within the text.

The other options don't capture this aspect effectively: humor through wordplay relates more to puns and jokes than allusions, character introductions pertain to character development or exposition, and summarizing the plot deals with providing an overview rather than enriching the reader's understanding through contextual connections. The emphasis on establishing connections underscores the importance of audience engagement in literature and communication.