Final answer:
The H-reflex evaluates reflex arcs in neurological examinations, particularly for motor nerve conduction, and helps distinguish between nerve dysfunctions.
Step-by-step explanation:
The correct description of NCS in the H-reflex is that d) H-reflex evaluates reflex arcs. Reflexes are responses that combine both sensory and motor pathways in the spinal cord, reacting to sensory inputs with motor responses. The H-reflex, specifically, is used to assess the nerve conduction of the reflex arc, typically in the lower extremity, and it can be used to distinguish between various types of nerve dysfunction. H-reflex testing is useful in assessing motor nerve conduction as it involves an electrical stimulus that replicates the activity normally seen in muscles following a deep tendon reflex.