Air is not visible because it:

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Is nearly a perfect transparent substance

Neither absorbs or reflects light

Transmits whole of light

Follows all of the above

answer is D.

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Detailed Solution

Concept- When light (electron magnetic wave) strikes a substance, some of the light is absorbed, some of the light is reflected, and the remaining light is transmitted through the substance. A substance must absorb and reflect some light with a wavelength that is within the range of visible light in order for it to be visible to the human eye.
Although we cannot see it, we are aware that air is present in the environment. This indicates that no visible light that strikes the air's molecules is reflected or absorbed by them. They thereby allow 100% of the light to pass through them. As a result, we can infer that air is invisible because it transmits all of the light instead of either reflecting or absorbing it. It appears as though light just diffuses across air.
Transparent substances are those that are invisible to the human eye. Air is a perfectly transparent substance since it is entirely invisible. Therefore, choices A, B, and C are the proper explanations for why air isn't seen.
Hence, option 4 is the correct answer.

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