Microscopic Study of the Contact Lens Fluid of a Person

Microscopic study of the contact lens fluid of a person with an eye infection revealed a series of four nested parasites: an amoeba, which contained a giant virus, which contained a smaller virus, which contained chunks of parasitic DNA.How could these four parasites best be characterized?

A) All are symbiotic microparasites, but only the amoeba is known to be pathogenic.
B) All are symbiotic microparasites that are also pathogens.
C) All are microparasites that are symbiotic but not pathogenic.
D) All are symbiotic microparasites, but only viruses, not amoebae, are pathogenic.
E) The amoeba is a macroparasite, the others are microparasites, and none are pathogenic.