This is a diagram of the ear.

Which structure is marked with an X?

optic nerve
auditory nerve
cochlea
stirrup

Hello, Your answer should be is Auditory Nerve

Explanation:

Because the "Auditory Nerve" bundle of nerves that carries hearing information, The cochlear nerve, also known as the acoustic nerve, is the sensory nerve that transfers auditory information from the cochlea (auditory area of the inner ear). Its not A, because the "Optic nerve" second pairs of cranial transmitting impulses to the brain. Its not really C, Because the "Cochlea" is a spiral cavity that is inside of the inner ear. And its not D, because the "Stirrup" is the stapes or stirrup is on the bone, by the middle ear of humans and mammels too. So your best answer will be Auditory Nerve.

answer: decibel

explanation:

a electromagnetic waves