A Population of Plants Comes in Two Flower Colors: Blue

A population of plants comes in two flower colors: blue and white. Blue-flowered plants produce seeds that grow into both white and blue flowers. Crossing two white-flowered plants produces only white-flowering offspring. This indicates that the white-flowering plants are:

A) homozygous dominant for the flower color allele.
B) homozygous recessive for the flower color allele.
C) heterozygous for the flower color allele.
D) mutating.
E) in equilibrium.