Which component of a play involves the agent’s response to change?

The correct choice is the term referring to the component of a play that involves the agent’s response to change. In dramatic structure, this aspect is essential because it shows how characters react to the events or transformations that occur throughout the narrative. This reaction not only helps to develop the character but also propels the story forward as the agent deals with new circumstances and challenges.

In a play, characters often find themselves in situations that require adaptation or a change in behavior to confront obstacles. This response is critical to the development of the plot and the characters' arcs. Understanding how characters react to changes in their environment, circumstances, or relationships typically gives insight into their motivations and conflicts.

The other terms provided do not specifically encapsulate this idea of an agent's response to change in the context of dramatic structure. For instance, "Active segment" and "Reactive segment" might seem relevant, but they do not carry the same connotation regarding emotional and behavioral response to change in the same way that "Decrescence" or "Crux" would not accurately describe this specific component either. The focus on character response to change is central to creating dynamic and engaging theatrical experiences.