Widow's-Peak Hairline in Humans Is Dominant to Non-Widow's-Peak Hairline

Widow's-peak hairline in humans is dominant to non-widow's-peak hairline.If a person has a widow's-peak hairline,what is his or her genotype?

A) The genotype must be homozygous recessive.
B) The genotype is either homozygous dominant or homozygous recessive.
C) The genotype must be heterozygous.
D) The genotype is either heterozygous or homozygous dominant.
E) The genotype must be homozygous dominant.