Context: In a group of rabbits, 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).
Mickey is a rabbit from this group. Mickey has the homozygous genotype ff for the fur color gene.
Based on this information, what is Mickey's phenotype for the fur color trait?
A. black fur
B. brown fur
From the given choices, choose the correct answer and respond with the letter of that choice.

B