The correct option is C Absorption through integument
The tapeworm belongs to Platyhelminthes. These are acoelomate and triploblastic. It has no digestive tract at all and not mouth or anus. Instead, the strobilus exhibits contact digestion. It sits inside the host intestine absorbing nutrients through its body wall, utilizing both host enzymes and its own enzymes in its own surface membrane.
So, the correct answer is option C.