Concept: The diagram shows a wave spreading or bending around a barrier or opening.
Explanation:The property illustrated is diffraction.
Diffraction occurs when waves bend around the edges of an obstacle or spread out after passing through a narrow gap.
This bending causes the wavefront to change direction and enter the region behind the obstacle.
Refraction involves a change in speed and direction when a wave passes from one medium to another.
Polarisation refers to the restriction of vibrations to a single plane.
Interference is the superposition of two or more waves producing reinforcement or cancellation.
Therefore, the wave property shown is clearly diffraction.
Answer: A. Diffraction
