During Middle Adulthood, How Does Hearing Ability Change

During middle adulthood, how does hearing ability change?

A) Higher frequencies need to be louder in order to be heard.
B) Lower frequencies need to be louder in order to be heard.
C) The ability to hear human speech remains constant, but the perception of tonal elements decreases.
D) The ability to listen to speech in a crowded environment declines, while the ability to listen to someone alone without background noise increases.