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 F is for black fur, and the allele f is for brown fur.
Howie, a Labrador retriever from this group, has brown fur. Howie has two alleles for brown fur.
Based on this information, what is Howie's phenotype for the fur color trait?
A. brown fur
B. ff
Answer with the option's letter from the given choices directly.

A