Context: This passage describes the albinism trait in rats:
Albinism is a trait in many animals that prevents the production of melanin. Melanin is a pigment that colors the skin, eyes, hair, and other body parts. The more melanin an animal has, the darker its body parts are. Rats with albinism lack melanin, so they often have white fur and pink eyes.
In a group of rats, some individuals have albinism and others do not. In this group, the gene for the albinism trait has two alleles. The allele for not having albinism (A) is dominant over the allele for having albinism (a).
This Punnett square shows a cross between two rats.
What is the expected ratio of offspring that have albinism to offspring that do not have albinism? Choose the most likely ratio.
A. 2:2
B. 1:3
C. 3:1
D. 0:4
E. 4:0
From the given choices, pick the correct answer and respond by indicating the letter of the correct option.

B