Final answer:
The correct answer to the question is b) Olfactory bulb, which is where olfactory cells synapse beneath the frontal lobes of the brain.
Step-by-step explanation:
Olfactory cells synapse in the olfactory bulb beneath the frontal lobes of the brain. Therefore, the correct answer is b) Olfactory bulb. The axon of an olfactory neuron extends from the olfactory epithelium through the olfactory foramen in the cribriform plate of the ethmoid bone into the brain, where they connect to the olfactory bulb on the ventral surface of the frontal lobe. From the olfactory bulb, the axons of olfactory neurons split and travel to several brain regions, including the primary olfactory cortex and the limbic system, aiding in the association of smells with memory and emotion. The olfactory system is unique in that it is the only sensory system that does not synapse in the thalamus before relaying information to the cerebral cortex.