Read the following sentence and choose the correct option.

The colour red appears at sunrise and sunset because of:

• The sun is close to the horizon at sunrise and sunset. As a result, the sun's rays must traverse a greater portion of the atmosphere.
• Because the wavelength of red is longer than that of blue or any other visible colour, it scatters less than the other colours as the sun light travels through the atmosphere.
• Only the least scattered red light reaches our eyes and appears to be emitted by the sun. As a result, the sun appears red at both sunrise and sunset.

The scattering of sunlight causes the sun to turn red at sunset and sunrise.