Neurons may be classified according to several characteristics. Which of the following is correct? A. Group A fibers are mostly somatic sensory and motor and are the smallest in diameter. B. Group C fibers are not capable of saltatory conduction. C. Group B fibers are highly myelinated and have the highest conduction velocities. D. A small cross-sectional area allows shorter conduction times.

Option (B).

Explanation:

Neurons or nerve cell are the basic structural and functional unit of the nervous system. Fibers are the thread like long projection of the nerve cells.

Neurons are classified into three fibers - Group A fibers, B fibers and C fibers. The group C fibers cannot capable of doing the saltatory conduction of the nerve impulse because they are unmyelinated.

Thus, the correct answer is option (B).