article: It's Saturday evening. Bruce is having a birthday party. There are a lot of children at the party. They play together for an hour. Then Bruce's mother gives them some food. But she forgets to give Sam any.
  Sam feels wronged but then he remembers his mother's words, "Be polite . Don't ask for food." So he waits for a few minutes, then he holds his plate up over his head and says loudly, "Does anyone want a nice clean plate?"
question: Who gives them some food?
options: Bruce's father Bruce's uncle Bruce Bruce's mother