In pigs, the allele for a wavy, rough coat (R) is dominant to the allele for a soft, fine coat (r). A rough coat boar and a soft coat sow mate. They produce several litters, 50% are rough coat and 50% are smooth coat. What were the genotypes of the parents?

Responses
A RR × rrRR × rr
B Rr × rrRr × rr
C RR × RrRR × Rr
D Rr × Rr