Select the best definition of Recurrent laryngeal nerve.

A. The principal nerve of the anterior thigh, supplying quadriceps and enabling knee extension. B. A branch of the vagus nerve that supplies nearly all intrinsic muscles of the larynx. C. A specialized pacemaker region located near the superior vena cava in the right atrium. D. The main somatic nerve of the perineum, arising from sacral roots S2 to S4.