Context: In a group of rainbow trout, some individuals have a greenish-brown body and others have a blue body. In this group, the gene for the body color trait has two alleles. The allele B is for a greenish-brown body, and the allele b is for a blue body.
A certain rainbow trout from this group has a greenish-brown body. This trout has one allele for a greenish-brown body and one allele for a blue body.
Based on this information, what is this rainbow trout's phenotype for the body color trait?
A. Bb
B. a greenish-brown body
From the given choices, choose the correct answer and respond with the letter of that choice.

B