Respuesta :
Answer:
A. Glial cells.
Explanation:
Different types of glial cells have different functions. The oligodendrocytes serve to speed up the condition of action potential by formation of myelin sheath around the axon. Microglia are the glial cells that detect and kill the foreign invaders of neurons. Astrocytes are the glial cells that provide nutrients to neurons, hold them in place and digest the dead neurons.