What does Ralph discover that upsets them greatly in lord of the flies?

Answer 1

The huts he's building for the litluns keep falling down.

Answer 2

Ralph was upset that the hunters, who were on signal fire duty, had gone off to hunt with Jack and allowed the fire to go out. He was upset because there was no signal fire to attract a ship that had passed and they had therefore failed to be rescued. Perhaps more importantly still he was upset because none of the hunters seemed to grasp the enormity of their failure to keep the signal fire lit.

Answer 3

Ralph discovers that the boys on the island have allowed the signal fire to burn out while a ship passed by, missing their chance to be rescued. This upsets Ralph greatly as he realizes the missed opportunity for rescue and the lack of responsibility among the boys.

Answer 4

The huts he's building for the litluns keep falling down.