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 B is for a greenish-brown body, and the allele b is for a pink body.
A certain Nile tilapia fish from this group has a greenish-brown body. This fish has two alleles for a greenish-brown body.
Based on this information, what is this Nile tilapia fish's phenotype for the body color trait?
A. a greenish-brown body
B. BB
From the given choices, select the correct answer and reply with the letter of the chosen option.

A