Answer:
Flashbacks are part of the story.
Step-by-step explanation:
Non-linear plot development is when the narration is done in an unsystematic pattern. This means that the events in the plot are narrated in such a way that the plot moves from one point to another, at times moving back to the past, not in a chronological manner.
Among the given choices, an example of non-linear plot development is the use of flashbacks in a story. Flashbacks refer to the use or presence of a scene from the past but shown in the present scene to bring back some memories or refer to something from the past events. And this process of moving from the present to the past and then to the present distorts the sequential or chronological flow of the plot's timeline.
Thus, the correct answer is the fourth option.