Answer:
A. He conceals information about Jimmy until the end of the story.
Step-by-step explanation:
O. Henry crafts "After Twenty Years" to create surprise he conceals information about Jimmy until the end of the story. In the first part of the story, a policeman is making sure everything is right in the neighborhood. He runs into a man who is waiting for a friend with whom he was supposed to meet after twenty years. Bob is a well-to-do man who made money in the West. He is waiting for Jimmy. After the policeman leaves Bob is arrested by another man that is supposed to be Jimmy. Only by the end of the story, we learn that Jimmy was the first policeman.