Refer to the figure, which shows the organ of Corti in the human inner ear. 
Damage to which of the labeled structures would most directly interfere with the ability of the inner ear to determine the pitch of a sound? Provide the letter and the correct name of the structure.
Definitions:
Arteries
Blood vessels that carry oxygenated blood away from the heart to the body's tissues, except for the pulmonary arteries which carry deoxygenated blood to the lungs.
Deoxygenated Blood
Blood that is rich in carbon dioxide and low in oxygen, typically found in the venous system and right chambers of the heart.
Right Atrium
The upper right chamber of the heart that receives deoxygenated blood from the body and pumps it into the right ventricle.
Vena Cava
A large vein carrying deoxygenated blood into the heart, with two principales types: the superior and the inferior vena cava.
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