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?
        
             
        
        
        
Character vs . society or character vs nature
        
             
        
        
        
It is interrogative because a question is being asked. It is usually interrogative  if there is a question mark at the end.