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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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