Brown Eyes Are Dominant Over Blue Eyes

Multiple Choice

Brown eyes are dominant over blue eyes. Suppose that two brown-eyed parents gave birth to a blue-eyed child. It may be inferred that

A) a man other than the husband is the father of the child.
B) the husband is the father, but the wife is not the mother.
C) both parents are homozygous for brown eyes.
D) both parents are heterozygous for brown/blue eyes.