Why does the sky appear blue?

Correct option is D

The reason the sky appears blue is due to scattering of sunlight by air molecules the blue color light in white light has a shorter wavelength and gets scattered the most by air molecules. Sunlight is a combination of all colors in the visible spectrum, ranging from red (longer wavelength) to violet (shorter wavelength). When sunlight enters Earth's atmosphere, it interacts with air molecules. These molecules scatter the sunlight in various directions. Shorter wavelengths of light are scattered more than longer wavelengths by air molecules. Since blue light has a shorter wavelength compared to red or green light, it gets scattered the most by air molecules throughout the atmosphere. This scattered blue light reaches our eyes from all directions, making the sky appear predominantly blue.