In Mendel's Pea Plants,yellow Seeds Are Dominant to Green Seeds

In Mendel's pea plants,yellow seeds are dominant to green seeds.Purple flowers are dominant to white flowers.Use Y and y for the seed color alleles and P and p for the flower color alleles.Flower color and seed color assort independently.If a plant that is heterozygous for both flower color and seed color genes is self-fertilized,what proportion of the offspring will have one of the dominant phenotypes,either the seed color or flower color,but not both?

A) 6/64
B) 6/32
C) 6/16
D) 9/32
E) 9/16