Answer:
If the author wanted to establish that the main character was looking back on the events of his long, full life, the author might begin the story B) With the main character as an 85-year old man, deep in thought about everything he has been through over the course of his life.
Step-by-step explanation:
When we start the story with a character who is 85 years old we can assume that they have had many experiences to talk about, so if the objective of the author is to remanence the life of the character this would be the best point to start from going backward checking on past events or starting from the first memories to the last but all from the perspective of a person who has lived long.