George Has Blue Eyes

Multiple Choice

George has blue eyes. What do we know for sure about George's parents?

A) Both parents had only dominant alleles for eye colour.
B) One parent had dominant alleles for eye colour and the other had both dominant and recessive.
C) Each must have carried a recessive gene for blue eyes.
D) Both parents had green eyes.
E) We cannot really predict the genotype for George's parents.