In fruit flies, the gene for red eyes (R) is dominant and the gene for sepia eyes (r) is recessive. If a red-eyed homozygous fly (RR) and a red-eyed heterozygous fly (Rr) mate together, what are the possible genotypes of their offspring? (Hint: You many want to complete a Punnett square.)

ARR and rr

BRr only

CRr and RR

DRR, Rr, and rr