Context: In a group of guppies, some individuals have a spotted tail and others have an unspotted tail. In this group, the gene for the tail spots trait has two alleles. The allele for a spotted tail (I) is dominant over the allele for an unspotted tail (i).
Marina is a guppy from this group. Marina has the homozygous genotype ii for the tail spots gene.
Based on this information, what is Marina's phenotype for the tail spots trait?
A. a spotted tail
B. an unspotted tail
From the given choices, select the correct answer and reply with the letter of the chosen option.

B