Answer:
Explanation: Let me know if this helped or you need any more have a nice day!
In the chapter "The Open Window," Mr. Framton changed the topic of conversation by pretending to see a ghost (Option 4). This can be seen when he noticed the open window and asked if it had been left open for the "Saki's tragedy." Mrs. Sappleton's niece, Vera, then took advantage of his vulnerability and told him a fabricated story about her aunt's encounter with the ghosts of her husband and brothers. Mr. Framton was clearly unnerved by this, which caused him to abruptly leave the room (Option 2).
So, to summarize, Mr. Framton changed the topic of conversation by pretending to see a ghost, and this action led to his decision to abruptly leave the room.