A) the atoms or molecules are called scattering Centre . Let us take the same angle  thitta between the incident light and a direction in which  the intensity if scattering light is observed, we call this angle as angle of scattering.

B) We know that our atmosphere contains in different types of molecules and atoms. The Reason for blue sky is due to the molecules N2 and O2 . the sizes of these molecules are comparable to the wave length of blue light.  These molecules act as scattering centres for scattering of blue light

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this is absolutely write answer this answer told by my teacher in classroom today for this qustion
C) factors influence scattering ---- answer) size of the atom or molecule is comparable to the wave length of light
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Let the light rays fall on a surface at an angle. Normally, light wave or rays are refracted or reflected in the directions known by the laws.

Scattering of light is the deviation of the light waves from directions of usual reflection and refraction. Light waves or rays are scattered in all possible directions with varying intensities.

The molecules of the medium in the path of light absorb light (energy) and re-radiate it in all possible directions. All these molecules or atoms or particles which re-radiate energy are called the Scattering Centers.

Scattering Angle: (see diagram)

This is the angle between the incident wave (ray) and the scattered light wave.

Factors influencing scattering:

When the size of the objects (particles) on which the light waves are incident is comparable to the wavelength, then scattering is very high and is inversely proportional to 4th power of wavelength. So red light is scattered the least.

Scattering depends also on the refractive index of the medium (optical density) or speed of light in the medium. If the medium is gas or air, then it depends on the density or molecular concentration.  If the medium is a solid and the surface is very smooth then scattering is very less from that surface. Scattering is more from a rough surface.

Scattering of light may also depend on whether light waves are polarized or not.

Intensity of light or amount of light scattered in a direction depends on the angle of scattering.