The correct answer is - A) Photosphere.
The Sun has multiple layers in its atmosphere, and all of them are very massive. Some are much denser than the others, so what we actually see from the Earth is the denser part of the Sun's atmosphere, the photosphere. the photosphere is actually the lowest part of the Sun's atmosphere, and it is the one that covers it. When we look at the Sun in white (visible) light, we are actually only seeing the photosphere of the star of our solar system.
