What type of nerve fibers primarily transmit sensory information?

The correct answer is based on the roles of different types of nerve fibers in the nervous system. Afferent fibers are primarily responsible for transmitting sensory information from sensory receptors to the central nervous system (CNS). These fibers gather sensory data regarding various stimuli, such as touch, temperature, pain, and proprioception, and relay that information to the brain for processing.

Efferent fibers, in contrast, carry motor commands from the CNS to peripheral targets, influencing muscle contraction and gland secretion. Somatic fibers refer specifically to those fibers that are part of the somatic nervous system, which includes both sensory (afferent) and motor (efferent) fibers but does not exclusively pertain to sensory transmission. Autonomic fibers are involved in involuntary bodily functions and relay information that regulates automatic processes, such as heart rate and digestion, rather than sensory input.

Therefore, afferent fibers are specifically tailored to the task of sensory information transmission, making them the correct choice in this context.