In Mendel's Pea Plants,round Seeds (R)were Dominant,and Wrinkled Seeds (R)were

In Mendel's pea plants,round seeds (R) were dominant,and wrinkled seeds (r) were recessive.The endosperm of the pea is also either starchy,a dominant gene (S) ,or waxy,the recessive allele (s) .If these genes are not linked,which of the following is true of a heterozygous dihybrid cross?

A) It is impossible to obtain offspring that are homozygous for both dominant genes.
B) It is impossible to obtain offspring that are homozygous for both recessive genes.
C) It is impossible to obtain offspring that are homozygous for one dominant gene such as round seed and homozygous recessive for the other recessive waxy gene.
D) It is possible to produce offspring that are homozygous dominant for both traits, homozygous dominant for one trait but not the other, and homozygous recessive for both traits.