Twinkling of stars is due to atmospheric:

dispersion of light by water droplets

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refraction of light by different layers of varying refractive indices

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scattering of light by dust particles

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internal reflection of light by clouds

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Solution

The correct option is B refraction of light by different layers of varying refractive indices
The atmospheric refraction occurs in a medium of gradually changing refractive index. The path of rays of light coming from the star goes on varying slightly. The apparent position of the star fluctuates and the star appears to twinkle.

Suggest Corrections

LIST I	LIST II
A) Rainbow	1) Scattering of light
B) Twinkling of stars	2) Dispersion of light
C) Blue colour of sky	3) Fluctuation of the refraction index in atmosphere layers
D) Advancement of sunrise and delay of sunset	4) Refraction of light