A patient who recently immigrated from a rural area presents with anemia and abdominal discomfort. Stool examination reveals large, multicellular parasitic organisms. Which statement best describes helminths?

Helminths are unicellular parasites that reproduce by budding

Helminths are multicellular parasitic worms classified as flatworms or roundworms

Helminths are prokaryotic organisms lacking organ systems

Helminths are free-living aquatic organisms with cilia