Opening a story in medias res means starting in the middle of the action, rather than at the beginning. One advantage of doing this is:
B. It makes the reader wonder what happened before and what will happen after.
By beginning a story in medias res, the reader is immediately drawn into the story and is curious about the events that led up to the current situation. This technique creates a sense of mystery and engages the reader's interest, making them eager to find out more about the characters and their journey. It adds a layer of intrigue and suspense to the narrative, encouraging the reader to keep turning the pages to uncover the backstory and see how the story unfolds.