A 22-Year-Old Man Receives a Severe, Traumatic Compression Injury to His

A 22-year-old man receives a severe, traumatic compression injury to his radial nerve during a motorcycle crash. He shows an advancing Tinel sign. Which one of the following characterizes regeneration of axons after this nerve injury?

A) It occurs in the absence of motor nerve action potentials.
B) It occurs at a rate of about $100 \mathrm{~mm} / \mathrm{d}$ .
C) It occurs in the segment distal to the site of axon damage.
D) It occurs by a process that involves Schwann cell proliferation.
E) It occurs in conjunction with degeneration and phagocytosis of the endoneurium.