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The Sun appears reddish at sunrise and sunset because:
Answer & Solution
Correct answer: C.
1. At sunrise/sunset sunlight travels a long slant path through the atmosphere.
2. Shorter wavelengths (blue) are scattered out more strongly.
3. Mainly longer wavelengths (red, orange) reach the eye, giving the Sun a reddish look.
_Source: NCERT Class 10 Science, Ch 10 "The Human Eye and the Colourful World", §10.6_
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