Context: In a group of cows, some individuals have solid coloring and others have white spots. In this group, the gene for the coat pattern trait has two alleles. The allele A is for solid coloring, and the allele a is for white spots.
Franklin, a cow from this group, has solid coloring. Franklin has one allele for solid coloring and one allele for white spots.
Based on this information, what is Franklin's phenotype for the coat pattern trait?
A. solid coloring
B. Aa
Determine the correct option from the provided choices and reply with its corresponding letter.

A