the gravitational pull of the Sun the gravitational pull of Earth the composition of the Moon the phases of the Moon
I gave my students this multiple choice question: Approximately 59% of the Moon is visible from Earth because the Moon rotates and revolves in the same period. Which most likely causes this phenomenon?

Only one answer is correct among these 4 choices:
- the gravitational pull of the Sun
- the gravitational pull of Earth
- the composition of the Moon
- the phases of the Moon

Could you tell me which one is correct?

the gravitational pull of Earth