The is located deep within the brain, and it includes structures such as the substantia nigra and ventral tegmental area.

midbrain

Explanation:

The part of the vertebrate brain that is made up of the tectum and the tegmental area is known as the midbrain.It is also known as mesencephalon.The midbrain performs several functions such as Controlling the motor movements Auditory processingControl of eye movements Visual processing The midbrain is located deep inside the brain and as a part of its structure it includes - ventral tegmental area, substantia niagra, tectum, cerebral aqueduct and the cerbral peduncles.

Iam not sure but to me it with be a or dsorry if i was late! hope this ! : )if you really want me to find out the answer that is correct tell me and i will do more research but the a or d makes sense to me.