Context: In a group of Nile tilapia fish, some individuals have a greenish-brown body and others have a pink body. In this group, the gene for the body color trait has two alleles. The allele for a greenish-brown body (B) is dominant over the allele for a pink body (b).
A certain Nile tilapia fish from this group has the homozygous genotype BB for the body color gene.
Based on this information, what is this fish's phenotype for the body color trait?
A. a greenish-brown body
B. a pink body
Answer with the option's letter from the given choices directly.

A