Two Pure-Breeding Phlox Plants Were Crossed, One with Dark-Blue Flowers

Multiple Choice

Two pure-breeding phlox plants were crossed, one with dark-blue flowers and the other with pink flowers. The F1 generation all had dark-blue flowers. When the F1 were crossed with each other, the F2 generation consisted of 176 plants: 101 with dark-blue flowers, 33 with light-blue flowers, 30 with red flowers, and 10 with pink flowers
-How is flower color controlled in phlox?

A) one gene with four alleles
B) one gene with two codominant alleles
C) two genes whose alleles interact additively
D) two genes with dominant epistasis