Among humans, IA is the allele for blood type A, IB is the allele for blood type B, and i is the allele for blood type O.
What is the probability that the offspring of a heterozygous man with blood type A (IAi) and a heterozygous woman with blood type B (IBi) will have blood type O?
A. 0%
B. 25%
C. 50%
D. 75%
E. 100%