Answer: Afferent
Explanation: Afferent visceral fibers conduct nerve impulse originating in receptors located in the viscera (visceroceptors) to the CNS.
In general, these fibers integrate predominant visceral (afferent) nerves together with autonomic fibers (efferent). Most lead impulses that do not become conscious unlike somatic.
We are continually reaching our CNS impulses that tell us about the blood pressure and the oxygen content of the blood, without our noticing it.
They are unconscious afferent impulses, important for performing various visceral reflexes or somatic viscera, as in the example above, the control of blood pressure and blood oxygen rate.