Use the following information to answer the question. Giardia intestinalis is an intestinal parasite of humans and other mammals that causes intestinal ailments in most people who ingest the cysts. The cysts are dormant forms of this protist that are expelled in the feces of organisms that ingest them. Which of the following structures to the cysts of Giardia function most like?
A) mitochondria of ancestral diplomonads B) nuclei of archaeans C) endospores of bacteria D) capsids of viruses