The correct option is C Unicellular glands around the ootype in Taenia
Platyhelminthes are the acoelomate and have a flat body. They are characterized by the presence of a special gland known as Mehlis glands, also called 'Shell gland' is primarily present surrounding the ootype of Platyhelminthes and is a part of the female reproductive organ of Platyhelminthes. It is unicellular gland of egg-shaped or shell-shaped and is attached with the ootype through certain fatty members.
So, the correct answer is option C.