Answer:
Earth's primary source of light energy is the sun.
Explanation:
Proxima centauri is located in the southern constellation of centaurus. It is a small low mass star and is 4.243 light years away from the Earth. It means it will take 4.243 years for light to reach earth from Proxima centauri.
So, it is too small and too far away from Earth to act as a source of light energy for Earth.
Moon is not a star and thus not a source of light energy for Earth. It is a natural satellite that permanently revolves around the Earth.
A wave is simply a disturbance or oscillation in the medium. eg. EM waves, sound waves. etc.
Sun is a star at the center of our solar system. It is a huge, spinning sphere of hot plasma. It is only 1.581 * 10⁻⁵ light years away from the Earth and is the primary source of light energy for Earth.
