question:  What new discovery does William make at the end of the story?
context: [Transcriber's Note: This etext was produced from Galaxy Science Fiction December 1959. Extensive research did not uncover any evidence that the U.S. copyright on this publication was renewed.] When he began his talk with "You got your health, don't you?" Not if you believe me. For punishment, he locked me in a windowless room and told me to sit still until he came back. Because they were real, I talked about them as if they were real, and I almost earned a bunk in the home for retarded children until I got smart enough to keep the beasts to myself. My mother and father must have been glad when I was sent away to reform school after my thirteenth birthday party, the one If you believe any of this at all, you'll see why it couldn't be me who did the stealing. Some skin-and-bones character I didn't know struggled out of his seat, amening. As soon as I got cleaned up, I was going to have dinner in a good restaurant, and I was going to order such expensive food and leave such a large tip for the waiter and send one to the chef that they were going to think I was rich, and some executive with some brokerage firm would see me and say to himself, "Hmm, executive material. Following the wallboard, I went down the side of the room and behind the last row of chairs, closer, closer, and halfway up the room again to the entrance—the entrance and the little wooden box fastened to the wall beside it. The box was fastened to the vertical tongue-and-groove laths of the woodwork, not the wall. Just as I seen it for the first time, the electricity wound the spring motor inside like a chicken having its neck wrung. "This," Brother Partridge said, "is one of the most profound experiences of my life." "A vision of you at the box projected itself on the crest of my soup," the preacher explained in wonderment.
output:  He is experiencing auditory hallucinations
options:  He is experiencing auditory hallucinations  He is reliving the same traumatic experience each day  The man he murdered was actually his father  The man he thought he murdered never died