Answer: A
Explanation: A flashback is when the story is interrupted to go back in time to descr some even inside the story.
An abandoned office would most likely be the best one. Just by hearing the word abandoned, it can give people chills because they don't expect what that abandoned office have. In a fiction story, it might have zombies or something.
C.
It seems to be the most fitting answer.
I would say C is the correct answer