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

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. What is the relationship between the Y and P?

A) They are two different genes on two different chromosomes.
B) They are two different genes on the same chromosome.
C) They are two different chromosomes in the pea plant.
D) They are the pleiotropic effects of a single gene.
E) They are incompletely dominant alleles of the same gene.