20. Two parents think their baby was switched at the hospital. It’s 1968, so DNA fingerprinting technology does not exist yet. The mother has blood type “O,” the father has blood type “AB,” and the baby has blood type “B. Was the baby switched?

A. No, because a cross between type O and type AB have a homozygous B offspring.

B. No, because a cross between type O and type AB have a heterozygous B offspring.

C. Yes, because a cross between type O and type AB don’t have a homozygous B offspring.

D. Yes, because a cross between type O and type AB don’t have a heterozygous B offspring.​