Whose idea is it to take carrots from Bunce's Storehouse and for what reason?

One of the Small Foxes comes up with the idea to gather some of the carrots within Bunce's Storehouse. Though Mr. Fox at first thinks his child is being foolish, the young fox soon explains that the rabbits who will be attending the feast at the Fox family home will need vegetarian options. At this point, Mr. Fox becomes proud of his thoughtful young child and tells the child as much.