The correct option is
D 1 in 4
Albinism is hereditary lack of pigmentation in an organism. It is an autosomal recessive disorder.Albino humans lack dark pigment melanin in their skin, hair or eyes. The allele responsible is recessive to allele for normal pigmentation. Father's and mother's genotype is Aa. They both are carriers of the disease. The chances of this couples fifth child being an albino are 1 in 4as the alleles will follow independent assortment and random fusion.
So, the correct answer is '1 in 4'