A right or immunity granted as a peculiar benefit, advantage, or favor : prerogative especially : such a right or immunity attached specifically to a position or an office.
Because the prince didn't like foxes?
Because he was sleeping?
Because there wasn't any prince?
Because the fox was a liar?
Because the prince's parent didn't allow him to play?
A character in a work of fiction has a reason for what they do, this is called motivation.
Answer:
My mother said that she wanted her house to look clean and nice at Tet holidays.