What can a catalyst in a narrative be described as?

A catalyst in a narrative is best described as an inciting incident because it refers to a moment or event that triggers the main action or conflict within the story. This pivotal moment often motivates the protagonist to take action or sets the events of the narrative into motion, propelling the plot forward and leading to significant developments. It plays a crucial role in shaping the direction of the story and engaging the audience's interest.

Other options, such as a transitional phrase, a recurring theme, or a descriptive passage, do not hold the same narrative function as a catalyst. While each of those elements contributes to a narrative in its own way, they do not serve the specific purpose of initiating the central conflict or action that a catalyst does. Hence, identifying the role of an inciting incident can help readers understand how the narrative unfolds and develops.