Four brothers and sisters, A. B, C, D, A said: Ding is the youngest sister. B said: There is only a brother and a boy among the brothers and sisters, and C said: I am A's sister. If all of the above are true, the following inferences are true:. ['A ranks second and is a boy; B ranks third and is a girl.', 'B is ranked second and is a girl; C is ranked first and is a girl.', 'C ranks second and is a girl; D ranks smallest and is a girl.', 'A ranks second and is a girl; C ranks first and is a girl.']