Final answer:
Somatic sensory fibers, which are afferent, provide sensory information below the pectinate line and follow the path of the internal iliac arteries.
Step-by-step explanation:
The fibers that provide sensory information below the pectinate line are somatic sensory fibers, which are referred to as afferent fibers. These afferent fibers are associated with areas that are very sensitive to pain and different sensations, contrasting the less sensitive visceral sensory fibers above the pectinate line. The somatic sensory fibers below the pectinate line course along the internal iliac arteries. They are part of the systemic circuit supplying the lower region of the body and are responsible for relaying sensory information to the central nervous system.
The correct answer to the student's question is: A) Afferent fibers; internal iliac artery.