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 genotype for the flower color gene?
A. dark yellow flowers
B. ff
Pick the correct answer from the listed options and provide the letter of the selected option.

B