Mr. Johnson was becoming slightly deaf. To test his hearing, his doctor held a vibrating tuning fork tightly against Mr. Johnson's jaw. This sent vibrations through the bones of the skull, setting the fluid in the cochlea in motion. Mr. Johnson could hear the tuning fork this way, but not when it was held away from the skull a few inches from his ear. His hearing problem is most likely attributed to the
A. auditory nerve leading to Mr. Johnson's brain.
B. fluid of the cochlea.
C. auditory cortex of Mr. Johnson's brain.
D. hair cells in the cochlea.
E. tympanum or the bones of the middle ear.
Answer: E
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