The correct answer is D. Polarisation.
Sound waves are longitudinal waves, which means that the particles of the medium through which they travel vibrate in the same direction as the wave is traveling. This is in contrast to transverse waves, in which the particles of the medium vibrate perpendicular to the direction of the wave.
Polarization is a property of transverse waves that describes the orientation of the particles of the medium as they vibrate. In a polarized wave, all of the particles vibrate in the same direction. In an unpolarized wave, the particles vibrate in all directions.
Sound waves cannot be polarized because they are longitudinal waves. The particles of the medium through which sound waves travel vibrate in the same direction as the wave is traveling, so there is no way to define a direction of polarization.
Refraction, interference, and diffraction are all phenomena
that can occur with both longitudinal and transverse waves. Refraction is the bending of a wave as it passes from one medium to another. Interference is the superposition of two waves, which can result in a constructive or destructive interference pattern. Diffraction is the bending of a wave as it passes around an obstacle.I hope this explanation is helpful. Please let me know if you have any other questions.