Context: In a group of koi fish, some individuals have red eyes and others have black eyes. In this group, the gene for the eye color trait has two alleles. The allele E is for red eyes, and the allele e is for black eyes.
Marlin, a koi fish from this group, has black eyes. Marlin has two alleles for black eyes.
Based on this information, what is Marlin's phenotype for the eye color trait?
A. black eyes
B. ee
Determine the correct option from the provided choices and reply with its corresponding letter.

A