Brown-Eye Genes Are Dominant Over Blue-Eye Genes

Brown-eye genes are dominant over blue-eye genes. What is the best explanation for the fact that all the blue-eye alleles have not disappeared in the human population?

A) Some blue alleles are always hidden in heterozygotes.
B) The population is likely in Hardy-Weinberg equilibrium for that locus.
C) Brown-eyed people sometimes have a blue-eyed parent.
D) People with brown eyes tend to choose mates with brown eyes, and blue-eyed people tend to choose mates with blue eyes.