The Studies by Dybdahl and Lively on Snails and Their

The studies by Dybdahl and Lively on snails and their parasites demonstrated that

A) snails evolve more quickly in response to parasites than parasites do to snails.
B) snails cannot evolve in response to parasites.
C) parasites infect common genotypes of snails more easily than they infect rare genotypes.
D) snails and parasites evolved at the same rate.