The correct option is B Ependymal cells
Ependyma is the thin epithelium-like lining of the ventricular system of the brain and the central canal of the spinal cord. Ependyma is one of the four types of the neuroglia in the central nervous system and is involved in the production of cerebrospinal fluid.
Thus, the correct answer is (C), 'Ependymal cells'.