Dr Janelle Notices That in Some (Although Not All) Cases

 Dr. Janelle notices that in some (although not all) cases of multiple sclerosis (MS) one of the first symptoms is tingling or pain. Which of the following statements best explains why this might happen?

A) The fibers of the axons are reduced in diameter, so the information can't travel fast enough.
B) Neural signaling may not work properly as a result of nervous system demyelination.
C) The fibers of the axons are enlarged, slowing neural transmission.
D) Potassium is not cleared from the synapse efficiently, leading to fewer action potentials.