The sky appears dark to passengers flying at a very high altitude. Why?

Options

A. Scattering of light is not enough at such heights.
B. There is no atmosphere at great heights.
C. The size of molecules is smaller than the wavelength of visible light.
D. The light gets scattered towards the earth.

Answer

A

Explanation

At higher altitude the atmospheric medium is very rare, thus the scattering of light taking place is not enough at such heights. Hence, the sky appears dark to the passengers flying at very high altitude.