Explanation
The third choice makes the most sense. A pair of recessive alleles for skin color can mask the expression of alleles governing hair and eye color located at other sites on the chromosome. Albinos (animals with albinism) are characterized by a lack of pigment, which provides color, in the hair and eyes, and skin, even though each of these three features is governed by alleles at different sites on the chromosome. A lack of pigment is the result of a congenital, or inherited, absence of melanin.