In Duroc-Jersey hogs,skin color is determined by two pairs of alleles,$R/r$ and $S/s$. Any genotype containing at least one dominant $R$ allele and one dominant $S$ allele results in a red skin color. $A$ double recessive genotype $(rrss)$ results in a white skin color. All other genotypes result in a sandy skin color. If a Duroc-Jersey hog with the genotype $RrSs$ is crossed with a hog having the genotype $rrss$,what will be the phenotypic ratio of the offspring?

• A
  $1$ Red : $2$ Sandy : $1$ White
• B
  $9$ Red : $3$ Sandy : $4$ White
• C
  $12$ Red : $3$ Sandy : $1$ White
• D
  $1$ Red : $1$ Sandy : $2$ White