Answer:
Parallel.
Step-by-step explanation:
The different plot structures in literature gives a different yet distinct way of presenting how the stories are narrated. These plot structures also determine how the stories are to be perceived and understood by the reader.
In the given diagram, the plot-line shows a simple graph of the characters 1 and 2 going along the same structure, be it the exposition, rising action, climax, falling action and the resolution. They are parallel to one another. This type of plot is known as the parallel structure, like the case of Hamlet and Ophelia in Hamlet. Hamlet mourns the death of his father while Ophelia also mourns the death of her own father.