The sun appears reddish at sunrise or sunset because:

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The scattering of blue light is more than the scattering of red light

Red colour has the shortest wavelength

The scattering of red light is more than the scattering of blue light

The intensity of the sun reduces during sunrise and sunset

answer is C.

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Detailed Solution

During sunrise or sunset, the light has to pass through a greater distance in the atmosphere.
The blue light is removed as it gets scattered the most while the red colour has a maximum wavelength and the scattering is inversely proportional to the fourth power of the wavelength of the light.
Hence, the red colour is less scattered and reaches the observer.
Thus, we find the reddish colour of the sun during sunrise or sunset.

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