Context: In a group of cows, some individuals have horns and others do not. In this group, the gene for the horns trait has two alleles. The allele for not having horns (H) is dominant over the allele for having horns (h).
Ace is a cow from this group. Ace has the homozygous genotype hh for the horns gene.
Based on this information, what is Ace's phenotype for the horns trait?
A. not having horns
B. having horns
Identify the correct option from the choices provided and respond with the letter of the correct option.

B