Answer: The correct answer is "the direction of the light wave".
Step-by-step explanation:
Reflection is the phenomenon in which the ray gets reflected from the surface without getting absorb or transmit.
In this phenomenon, when the ray incidents on the surface then it bounces back from the surface. Only the direction of the light wave will get changed. The reflection occurs in the same medium. There will be no change in the speed.
For example, the reflection occurs in the case of the plane mirror.
Therefore, the answer is "the direction of the light wave".