Parental genotypes determine offspring blood types via Punnett square Steps:

• Homozygous group A woman has genotype I^A I^A, producing only I^A gametes.
• Heterozygous group B man has genotype I^B i, producing I^B and i gametes.
• Offspring genotypes: I^A I^B (from I^A and I^B) and I^A i (from I^A and i).
• Resulting phenotypes: AB blood type (I^A I^B) and A blood type (I^A i).

Why B is correct:

• Codominance of I^A and I^B with i recessive yields only A (I^A i) and AB (I^A I^B) phenotypes, per ABO inheritance rules.

Why the others are wrong:

• A: Excludes AB, but I^A I^B produces AB.
• C: Excludes A, but I^A i produces A; no pure B possible without i i.
• D: Includes B, but no I^B i offspring without maternal i allele.

Final answer: B