Why does the sky appear blue?

Question

Why does the sky appear blue? — Exam MCQ

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C. Blue has a relatively short wavelength and is strongly scattered by air molecules — Rayleigh scattering is stronger at shorter wavelengths, so blue light is scattered strongly.

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A. All colours except blue are most strongly absorbed by air molecules

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B. All colours of light are in the correct proportion

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D. White light is reflected by all air molecules

Why does the sky appear blue?

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