A Population of Plants Comes in Two Flower Colors: Blue

A population of plants comes in two flower colors: blue and white. Crossing two blue-flowered plants produces mostly blue-flowering offspring and some white-flowering offspring. Crossing two white-flowered plants produces only white-flowering offspring. This indicates that the white-flowering plants are

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