The statement most accurately describes the technique of in medias res is "It starts the play in the middle of the action, rather than at the beginning. "
Explanation:
In medias res is a literary device that the writers use when they start the story in the middle of the action or in the exact moment that the action has just happened and the development of the story and characters will be presented in a different way from the most traditional one as they make use of the flashback to explain the events.
I believe it is a autobiography because it is told by the person because they know all of the details and events that happened...? I am not 100% sure I am just trying to help.
