Selection Against a Deleterious Recessive Allele Is Replenished in the Population

Multiple Choice

Selection against a deleterious recessive allele is replenished in the population by mutation,and leads to a dynamic equilibrium in which the frequency of the recessive allele is a simple function of the mutation rate and the selection coefficient.Which formula represents this situation?

A) p²+2pq+q²
B)
C)
D) 1/2N
E) None of these