A simile. It’s a figure of speech
The correct option is They all pretend to be various members of the Radley family and act out the stabbing scene.
It is in chapter 4 after getting bored with several games that they started to play
So Jem's suggested game came from the gossip they had heard about BOO and his family adding their own imagination. Scout was Mrs. Rdley, Dill was Old Mr. Radley and Jem was Boo.
Yes im 100% sure that it is first person becuase then the narrator would be saying i me my things like that.