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 I is for a spotted tail, and the allele i is for an unspotted tail.
Pearl, a guppy from this group, has an unspotted tail. Pearl has two alleles for an unspotted tail.
Based on this information, what is Pearl's phenotype for the tail spots trait?
A. ii
B. an unspotted tail
Determine the correct option from the provided choices and reply with its corresponding letter.

B