Answer: The correct option is "amplifying each other".
Step-by-step explanation:
Interference is the phenomenon in which there is superposition of the waves travelling in the same medium.
The interference can be constructive and destructive.
Constructive interference: In this interference, the resulting wave is of maximum amplitude.
Destructive interference: In this interference, the resulting wave is of minimum amplitude.
Therefore, during constructive interference, two waves moving through the same medium will amplify each other.