Context: In a group of bitter melon plants, some individuals have dark brown seeds and others have light brown seeds. In this group, the gene for the seed color trait has two alleles. The allele for dark brown seeds (D) is dominant over the allele for light brown seeds (d).
A certain bitter melon plant from this group has the homozygous genotype dd for the seed color gene.
Based on this information, what is this plant's phenotype for the seed color trait?
A. light brown seeds
B. dark brown seeds
Choose the right answer from the options and respond with its letter.

A