After Surviving an Infection During the Plague of Athens (In

After surviving an infection during the plague of Athens (in the Peloponnesian War) ,Thucydides noted that he no longer feared the disease,"for the same man was never attacked twice." Unknowingly,he was referring to

A) the fact that minute amounts of pathogen remain in the body indefinitely,preventing recolonization.
B) the role of interferons in preventing replication of microbes.
C) the earlier Roman idiom that "lightning never strikes twice," which credited Zeus with protecting the unlucky.
D) the presence of "memory cells" that are protective in case of reexposure to the disease.
E) the tendency of microbes to deplete the resources they need from a given host,thus making recolonization unlikely.