Your Father Has Type B Blood, and Your Mother Has

Your father has type B blood, and your mother has type O blood. You learn that you also have blood type O. What does this tell you? ​

A) You father is homozygous for type B blood.
B) Your mother is heterozygous for type O blood. ​
C) Your father's genotype is I ^B i and your mother's genotype is ii . ​
D) Your father's genotype is I ^B I ^B and your mother's genotype is ii .
E) Your father's genotype is I ^A I ^B and your mother's genotype is ii . ​