Here's why this statement is the best explanation:

* The moon is a large, rocky body in space. It doesn't have its own internal source of light like the sun.

* The sun is the primary source of light in our solar system. It emits a vast amount of light and heat.

* The moon's surface is rough and uneven. This allows it to scatter and reflect the sunlight that falls on it.

Therefore, the moon appears to be shining because it's reflecting the sun's light, not because it's generating its own light.