In rabbit, black skin (B) is dominant over brown skin (b), and short hair (S) is dominant over long hair (s). All F1offsprings are heterozygous black-short haired. F1male crossed with F1female. In F2generation, what is the percentage of homozygous black-short haired offspring?
a)50%
b)12.5%
c)6.25%
d)18.75%