Context: In a group of Channel catfish, some individuals have a brown body and others have a white body. In this group, the gene for the body color trait has two alleles. The allele for a brown body (B) is dominant over the allele for a white body (b).
A certain Channel catfish from this group has the homozygous genotype bb for the body color gene.
Based on this information, what is this catfish's phenotype for the body color trait?
A. a white body
B. a brown body
Identify the correct choice from the options below and respond with the letter of the correct option.

A