question_answer

A married couple adopted a male child. A few years later, twin boys were born to them. The blood group of the couple is AB positive and 0 negative. The blood group of the three sons is A positive, B positive a.id 0 positive. The blood group of the adopted son is

A)  O positive                    

B)  A positive

C)  B positive                    

D)  Cannot be determined on the basis of the given data