Suppose That in a Population the Frequency of a Particular

Suppose that in a population the frequency of a particular recessive condition is 1/400. Assume the presence of only a dominant allele (A) and a recessive allele (a) in the population and that the population is at Hardy-Weinberg equilibrium. What is the frequency of the recessive allele that causes the condition?

A) 0.000625
B) 0.0025
C) 0.025
D) 0.05
E) 0.95