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 it more difficult to hear.
D) Having worked in a factory or at a job with exposure to chronically loud noises can contribute to hearing loss.