Answer:
The Story of the Triangle Factory Fire, because it dealt with the aftermath of the fire.
Explanation:
O' Henry's choice to have Jimmy write the note to Bob <em>provides the reader with insight into Jimmy's character and illustrates how different the two men are after twenty years</em>. After this time, Jimmy has become a police officer and Bob, a famous criminal. <em>They used to be friends when they were younger</em>. But when they meet after twenty years, Jimmy realizes that his friend is a known criminal who is being searched for, and, as he used to be close to him in the past, <em>he cannot arrest him on his own</em>, so he looks for another police officer to arrest his friend.
