Which of the following best describes why we see different moon phases? A. The moon revolves around the Earth once a month.
B. The earth revolves around the moon once a month.
C. The amount of sunlight hitting the moon changes over time.
D. The earth revolves around the run once a year. (This one ??)

It's C.

Explanation:

What we see as phases of the moon is the reflection of sunlight bouncing off the moon's surface.

A or C i dunno

Explanation:

The phases occur because the Sun lights different parts of the Moon as the Moon revolves around the Earth. That means the reason we see different phases of the Moon here on Earth is that we only see the parts of the Moon that are being lit up by the Sun