Which of the following statements is correct about the blood group of their four offspring?

A man whose blood group is heterozygous B is married to a woman whose blood up is also heterozygous B

A. Three of them belong to blood group B
B. Three of them belong to blood group O
C. None of them belongs to blood group O
D. Two of them belong to blood group B

Correct Answer:

Option A – Three of them belong to blood group B