Final answer:
The main theme of the short story is that sometimes people don't realize how much someone means to them until they're gone.
Step-by-step explanation:
The main theme of the short story is B) Sometimes people don't realize how much someone means to them until they're gone. The short story explores the idea that people often take their loved ones for granted and only appreciate them after they are gone. This theme is shown through the experiences of the characters and the way they reflect on their relationships. For example, the protagonist may lose a loved one and realize the importance of that person in their life.