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At sun rise or sun set, the sun appears to be reddish while at mid day it looks white. This is because :

A The sun is colder at sun rise and sun-set
B At sun rise or sun-set it is nearer to the earth
C At sun rise it is fresh and at sun-set it is about to be set
D Scattering due to dust particles and air molecules causes this phenomenon.
Answer & Explanation
Option: [D]

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