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 hairless body (b) is recessive to the allele for a hairy body (B).
Peanut is a deer mouse from this group. Peanut has the heterozygous genotype Bb for the body hair gene.
Based on this information, what is Peanut's phenotype for the body hair trait?
A. a hairy body
B. a hairless body
Identify the correct option from the choices provided and respond with the letter of the correct option.

A