Answer:
When Bruno's father raised his hand, it clearly showed his sign of authority, and that he had a high ranking in the "Fury's' army. This tells us that Bruno doesn't know what is happening just a little bit beyond the fence, and he is blindly following his father.
Hope this helps!
I have no idea but always wash your hands
In the first option, the narrator is describing an event that happened to the character Ulrich, and does not convey the sense of omniscience. The second and third option however, describes that which is happening in the land. Finally, the last option reveals the omniscient stance the narrator takes, as he shows insight into the characters thoughts.