Context: In a group of deer mice, some individuals have a hairy body and others have a hairless body. In this group, the gene for the body hair trait has two alleles. The allele for a hairy body (B) is dominant over the allele for a hairless body (b).
Holly is a deer mouse from this group. Holly has the heterozygous genotype Bb for the body hair gene.
Based on this information, what is Holly's phenotype for the body hair trait?
A. a hairless body
B. a hairy body
From the given choices, pick the correct answer and respond by indicating the letter of the correct option.

B