Answer :
Nerve tracts or fasciculi make up the anterior white columns.
What is Nerve tract?
A group of axons that connect the central nervous system's nuclei together is referred to as a nerve tract. This is referred to as a nerve in the peripheral nervous system and has accompanying connective tissue.
The central nervous system is where you'll find tracts, whilst the peripheral nervous system is where you'll find nerves. The central nervous system's white matter is made up of tracts rather than nerves.
Therefore, Option D is correct.
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