What is the function of a subplot in a play or novel?

The function of a subplot in a play or novel is to enhance the main theme by providing depth, which is why this choice is the correct one. Subplots often run parallel to the main plot and can develop themes, characters, and conflicts that complement or contrast with the primary storyline. By doing so, they enrich the narrative and offer readers a deeper understanding of the main themes being explored.

Subplots can introduce additional dimensions to the story, such as varied emotional responses or complex character relationships that illuminate the main theme more clearly. This layered storytelling allows the audience to engage with the text on multiple levels, leading to a more immersive reading experience.

While other options suggest possible roles of subplots, they do not fully capture their primary purpose. For instance, while subplots may sometimes introduce different characters or provide comedic relief, these aspects are secondary to their main function of enhancing the overall narrative through thematic connection and character development.