Non-myelinated  axons  differs  from myelinated in that they:: (A) Are more excitable, (B) Lack node of Ranvier, (C) Are capable of regeneration, (D) Are not associated with Schwann cells
Answer is B. Remember, two types of Schwann cell: Myelinating and non­myelinating types.
In the PNS, unmyelinated axons are surrounded by Schwann cells (non­myelinating), whereas myelinated axons are ensheathed by multiple wrapped membranes of Schwann cells, much as the oligodendroglia, that ensheath central axons.