The correct option is C Schwann cells
Neuroglia are supporting cells around the nerve cells. They are divided as macroglia and microglia.
Astrocytes are star-shaped macroglial cells that occur only in the central nervous system (CNS). Oligodendrocytes are macroglial cells that form myelin sheath around axons of the CNS. Schwann cells are macroglial cells that form myelin sheath around axons of the peripheral nervous system (PNS).
Microglial cells are phagocytic immune cells present in the CNS.