The correct option is D All of the above
The anterior end of the body of Taenia has a knob-like structure called scolex. The scolex is smaller than the head of a pin about 1 mm in diameter with 4 cup -like muscular suckers having radial muscles and an anterior round prominence. The rostellum having about 22 to 32 curved, chitinous hooks in two circles, the inner circle with larger hooks and outer circle with smaller ones.