Father has a blood group B : Mother has AB : Children are not likely to have the following blood group –

**Core Concept**
The question tests the understanding of **blood group genetics**, specifically the inheritance of ABO blood groups. The ABO blood group system involves three alleles: A, B, and O, with A and B being codominant over O.

**Why the Correct Answer is Right**
Given the father has blood group B (can be BB or BO) and the mother has AB (can only be AB since A and B are codominant), their children can inherit various combinations of these alleles. The mother can contribute either A or B, while the father can contribute B or O. Thus, possible genotypes and phenotypes of the children include AB, BB, BO, and AO, corresponding to the blood groups AB, B, and A, respectively.

**Why Each Wrong Option is Incorrect**
**Option A:** This choice might correspond to a possible blood group, depending on the specific option provided, which is not listed here.
**Option B:** Similarly, without the specific option, it's hard to directly address why it's incorrect, but typically, B could be a possible blood group for the children.
**Option C:** Again, without specifics, but generally, one of the options like A or AB could be incorrect based on the parental blood groups given.
**Option D:** This would depend on the actual option provided, but usually, one of the options would not be genetically possible given the parents' blood types.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that the O allele is recessive, meaning an individual must inherit two O alleles (one from each parent) to express type O blood. Since neither parent in this scenario can contribute an A allele if they are B, or if one is AB and the other is B, the children cannot be type O if the mother is AB and the father is B because the mother cannot contribute an O allele.

**Correct Answer:** Correct Answer: D. O