Susan, a mother with type B blood, has a child with type O blood. She claims that James, who has type A blood, is the father. He claims that he is not the father. Blood and DNA tests ordered by the judge reveal that James is homozygous dominant for type A blood. The judge rules that

AJames is right, he can not be the father

BSusan is right, James is the father

CSusan is not the real mother of the child and an error was made in the nursery

DIt is impossible to make a decision based on the limited data available