Context: In a group of rose plants, some individuals have light yellow flowers and others have dark yellow flowers. In this group, the gene for the flower color trait has two alleles. The allele F is for light yellow flowers, and the allele f is for dark yellow flowers.
A certain rose plant from this group has dark yellow flowers. This plant has two alleles for dark yellow flowers.
Based on this information, what is this rose plant's phenotype for the flower color trait?
A. dark yellow flowers
B. ff
Identify the correct choice from the options below and respond with the letter of the correct option.

A