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Sensory signals are transmitted through sensory neurons which include receptors cells. Sensory signals are those for vision, balance, hearing, touch, taste, and smell.

Option b is correct because the thalamus regulates sleep, alertness, and wakefullness. All sensory signals except for olfactory travel to the central nervous system and then routed to the thalamus and then the final processing region of the brain.

Option a is incorrect because sensory signals for vision travel to the thalamus before reaching the cerebral cortex.

Option c is incorrect because all sensory signals except olfaction are routed to the thalamus before the cerebral cortex.

Option d is incorrect because all sensory signals except olfaction are routed to the thalamus before the cerebral cortex.