Irregular reflection occurs due to:
A. failure of laws of reflection
B. irregularity in reflecting surface
C. irregular light
D. all of these

Hint: When light rays from one medium strikes the interface of two media and change its direction and moves back to the first medium, this is called reflection. The direction of the reflected rays depends on the type of the surface or the interface of the two media. Depending on this we can define two types of reflection- regular and irregular reflection.

Complete answer:
Reflection can be of two types. One is regular reflection and the other is irregular reflection.
Regular reflection is the reflection of light when they fall on a smooth surface. When parallel light rays are incident on a plane and smooth surface, the reflected light rays also have the same direction and are parallel to each other. This is regular reflection.

Irregular reflection occurs when the light rays fall on an irregular or non-uniform reflecting surface. Since, the surface is non-uniform parallel light rays are incident in different directions and the reflected rays reflected in different directions. Since, the direction of all the parallel rays become different after reflection, this type of reflection is called the irregular reflection.
So, the irregular reflection is due to irregularity in the reflecting surface.

So, the correct answer is “Option B”.

Note:
All reflections including the irregular reflection follow the laws of reflections. The laws of reflections are – the angle of incidence of the incident ray and the angle of reflection of the reflected ray are equal to each other. The incident ray, the reflected ray and the normal to the point of reflection are in the same plan.