In pea plants P represents purple flowers while p represents white, and T represents tall plants while t represents short. Biologists cross two pea plants, each with the genotype PpTt.

We would expect what phenotypic ratio from this dihybrid cross?
A) 1:1:1:1 ratio
B) 9:3:3:1 ratio
C) all dominant for both traits
D) all recessive for both traits