Context: In a group of scarlet rosemallow plants, some individuals have red flowers and others have white flowers. In this group, the gene for the flower color trait has two alleles. The allele for white flowers (f) is recessive to the allele for red flowers (F).
A certain scarlet rosemallow plant from this group has the homozygous genotype FF for the flower color gene.
Based on this information, what is this plant's phenotype for the flower color trait?
A. red flowers
B. white flowers
Determine the correct option from the provided choices and reply with its corresponding letter.

A