If the earth had no atmosphere, then which of the following statements is correct regarding this assumption?

There would have been scattering of sunlight. The sky would have looked like rainbow. There would not have been any scattering of sunlight. The sky would have looked red.

There would not have been any scattering of sunlight.

If the earth had no atmosphere, there would not have been any scattering. Then, the sky would have looked dark. The sky appears dark to passengers flying at very high altitudes, as scattering is not prominent at such heights.