The correct option is
C TaeniaScolex occurs in taenia. It is a knob-like and tetra radiate or quadrangular and measures about 1 mm. At its tip is a large aperture the mouth, which is surrounded by two rings of curved and chitinous hooks. It is the organ of attachment which through hooks remains embedded in the intestinal mucosa of the host. It bears four large suckers which are arranged along the four corners. The scolex continues behind into a slender neck.