Airborne chemical substances travel up the nose to the olfactory which is the receptor for smell.
a. bulb
b. cortex
c. cilia
d. base

Airborne chemical substances travel up the nose to the olfactory OLFACTORY CORTEX, which is the receptor for smell.

Explanation:

The olfactory cortex is the portion of the cerebral cortex that concocts olfactory data. It is required in the function of smell. It is found in the temporary lobe of the brain, which is associated with establishing sensory input. The olfactory cortex is further a part of the limbic system.

option a and d is the correct answer

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