A full moon appears white to us on earth because it A) emits white light B) reflects the light from earth C) reflects the light from the sun D) is in total darkness of space

C) Reflects the light from the sun

Explanation:

Moon does not emit its own light. The moonlight is primarily the sunlight that is being reflected form the surface of moon. The moon is actually quite black so only a little amount of sunlight is reflected back.

We see colour due to the presence of cones in our retina. When we look at the moon, the light coming from moon does not have enough intensity to excite or cone cells and thus only rod cell are get excited. As the rods can't sense colours so the moon appears white.