For rabbits, the allele for dark fur, $R$, is dominant over the allele for white fur, $r$. The diagram illustrates a cross between one rabbit with dark fur and one rabbit with white fur. What are the genotypes of the parents?
- A$Rr$ and $rr$
- B$RR$ and $rr$
- C$RR$ and $Rr$
- D$R$ and $r$