In plot structure, what term describes the tying up of loose ends, often referred to as the catastrophe in tragedies?

The term that describes the tying up of loose ends in a plot structure is known as the dénouement. In literary terms, the dénouement refers to the final part of a narrative where the complexities of the plot are unraveled and resolved, providing clarity to the story's outcome after the climax. This is a crucial element in storytelling, especially in tragedies, where the dénouement reveals the consequences of the events and character decisions, often leading to an emotional or dramatic resolution.

The other terms don't specifically focus on this aspect of the narrative. Exposition introduces background information and context, while the climax is the point of highest tension or conflict in the story, marking a turning point. Resolution, while similar in meaning, typically refers to the point in the narrative where things are officially settled, but it is often used interchangeably with dénouement. However, the term dénouement is more widely recognized in literary discussions for the specific act of tying up loose ends post-climax. Thus, the choice of dénouement as the correct answer highlights its specific role in the structure of a narrative.