The correct answer is D, cestode (tapeworm).  These solid-bodied organisms are composed of an anterior attachment organ called a scolex, which is followed by a chain of proglottids called a strobila.  Fluke is a common name for trematodes, which are generally dorsoventrally flattened helminths.  Flagellates are protozoa that use flagella for motility.  Nematodes are unsegmented helminths also known as roundworms.

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