Use the Following Information to Answer the Questions Below

Use the following information to answer the questions below.
A large population of laboratory animals has been allowed to breed randomly for a number of generations. After several generations, 25% of the animals display a recessive trait (aa) , the same percentage as at the beginning of the breeding program. The rest of the animals show the dominant phenotype, with heterozygotes indistinguishable from the homozygous dominants.
-In a Hardy-Weinberg population with two alleles, A and a, that are in equilibrium, the frequency of allele a is 0.2. What is the frequency of individuals with Aa genotype?

A) 0.20
B) 0.32
C) 0.42
D) 0.80
E) Genotype frequency cannot be determined from the information provided.