If W Represents the Allele for Purple Flower Color, and W

If W represents the allele for purple flower color, and w represents the allele for white flower color, what phenotypic ratio would you expect for the offspring of a testcross?

A) One WW: one ww
B) One WW: two Ww: one ww
C) Three WW: one ww
D) One WW: three ww
E) Three WW: two Ww: one ww