Context: In a group of Labrador retrievers, some individuals have black fur and others have brown fur. In this group, the gene for the fur color trait has two alleles. The allele for brown fur (f) is recessive to the allele for black fur (F).
Digby is a Labrador retriever from this group. Digby has the homozygous genotype ff for the fur color gene.
Based on this information, what is Digby's phenotype for the fur color trait?
A. brown fur
B. black fur
From the given choices, select the correct answer and reply with the letter of the chosen option.

A