For reproducing sound, a CD (Compact Disc) audio player uses a

The correct answer is C because a Compact Disc player uses optical technology rather than physical contact to read data. Inside the player, a semiconductor laser beam is focused onto the surface of the spinning disc. The disc contains microscopic pits and lands that represent digital data. When the laser hits these areas, the light reflects back differently. A photodetector senses these changes in light intensity and converts them into electrical signals, which are then processed into sound. Unlike older vinyl record players that use a needle, the laser beam allows for high precision and prevents physical wear on the disc.