Question

a young couple has been arguing about their son who has O blood type, meanwhile they are having A and B blood type. what might explain this outcome?
A. the husband is homozygotic B and his wife is heterozygotic A
B. The husband is heterozygotic A and his wife is heterozygotic B
C. the husband is heterozygotic B and his wife is homozygotic A
D. the husband is heterozygotic B and his wife is heterozygotic A
E. both of B and D are correct