Why does the princess's lover open the right-
 hand door without hesitating?
 O He believes the princess will lead him to the door with
 the lady
 O He does not care whether he lives or dies, since he
 cannot marry the princess.
 O He has a friend who is a courtier and has already found
 out the secret of the doors,
 O He is going to try to escape behind the right-hand door.