Which of the Following Is an Environmental Cause for Decreased

Which of the following is an environmental cause for decreased auditory acuity during middle adulthood?

A) The eardrum and other structures in the inner ear become less flexible.
B) In the brain,the auditory cortex becomes less efficient in processing information from the inner ear.
C) The cilia in the inner ear begin to thin making more difficult to hear.
D) Having a history of working within a factory or a job that exposes a person to chronically loud noises.