Which phenomena contributes significantly to the reddish appearance of the sun

Which of the following phenomena contributes significantly to the reddish appearance of the sun at sunrise or sunset?

  1. Dispersion of light
  2. Scattering of light
  3. Total internal reflection of light
  4. Reflection of light from the earth

Answer

Red colour is scattered the least by due to its largest wavelength.

The correct option is B.