Answer: The correct answer is reflection.
Explanation:
Refraction: It is the phenomenon in which the ray of light gets refracted when it travels from one medium to another due to the change in the speed of the light.
Reflection: It is the phenomenon in which the light gets bounces back from the barrier when it incidents on the barrier.
Interference: It is the phenomenon in which there is a superposition of the waves occur.
Absorption: The light wave gets absorb when it falls on the black body.
In the given problem, when a DVD is played, a laser light hits the surface of the disk and then returns to the detector. Here, the reflection phenomenon allows the DVD player to work.
Therefore, the correct option is (C).
