A. B, C, D, D, Wu are brothers and sisters of a family. It is known that A is a boy and has 3 sisters; B has a brother and a younger brother; C is a girl with a sister and a sister; D Is the oldest among all people; Wu is a girl, but she has no sister; she has neither a brother nor a sister. From the above description, which of the following conclusions can be derived? ['Already female and youngest.', 'Ding is female.', 'More girls than boys among six siblings.', 'A ranks third among six siblings.']