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(B) To determine the parents of a child with $O^+$ blood group,we consider the inheritance of $ABO$ blood types and the $Rh$ factor.$1$. For the $ABO$

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$A^+$ and $O^-$

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(B) To determine the parents of a child with $O^+$ blood group,we consider the inheritance of $ABO$ blood types and the $Rh$ factor.$1$. For the $ABO$ blood group: $A$ child with $O$ blood group must have the genotype $ii$. This means both parents must contribute an $i$ allele. Parents with $A$ $(I^A i)$,$B$ $(I^B i)$,or $O$ $(ii)$ blood groups can produce an $O$ child. Parents with $AB$ $(I^A I^B)$ blood group cannot produce an $O$ child.$2$. For the $Rh$ factor: $A$ child with $Rh^+$ $(+)$ blood group must have at least one dominant $Rh^+$ allele. If the child is $Rh^+$,at least one parent must be $Rh^+$.$3$. Evaluating the options:- Option $A$: $AB^-$ and $A^+$. $AB$ parent cannot produce an $O$ child.- Option $B$: $A^+$ and $O^-$. $A$ parent $(I^A i)$ and $O$ parent $(ii)$ can produce an $O$ child $(ii)$. $A^+$ parent ($Rh^+ Rh^-$ or $Rh^+ Rh^+$) and $O^-$ parent $(Rh^- Rh^-)$ can produce an $Rh^+$ child. This is a possible combination.- Option $C$: $O^+$ and $AB^+$. $AB$ parent cannot produce an $O$ child.- Option $D$: $B^-$ and $O^-$. Both parents are $Rh^-$,so they cannot produce an $Rh^+$ child.Therefore,the correct pair is $A^+$ and $O^-$.

Among the four couples given,who could be the biological parents of a child with $O^+$ blood group?

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