What causes the Moon’s phases?

A. The Sun lights up only one half of the Moon and as the Moon orbits the Earth we can sometimes see the unlit side of the Moon.
B. The Sun lights up only one half of the Moon and as the Sun orbits the Earth we can sometimes see the unlit side of the Moon.
C. The Earth’s shadow falls on the Moon, blocking the sunlight.
D. The Moon’s shadow falls on the Earth, blocking the sunlight.

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