Question

the olfactory nerves (cn i) are formed by supporting cells olfactory bulbs olfactory tracts axons of the olfactory neurons

Explanation:

The olfactory nerves (CN I) are cranial nerves responsible for the sense of smell. They are formed by the axons of the olfactory neurons. Olfactory neurons are bipolar neurons located in the olfactory epithelium. Their axons pass through the cribriform plate of the ethmoid bone to form the olfactory nerves. Supporting cells in the olfactory epithelium provide physical and metabolic support to the olfactory neurons but do not form the olfactory nerves. Olfactory bulbs are structures in the brain that receive input from the olfactory nerves (they are the first relay station for olfactory information), but they are not the component that forms the olfactory nerves. Olfactory tracts are bundles of axons that carry olfactory information from the olfactory bulbs to other parts of the brain (such as the olfactory cortex), so they are not the structure that forms the olfactory nerves.

Answer:

axons of the olfactory neurons