The moon appears half lit, half dark from the surface of Earth on two days each month. What causes this? (1 point)

Earth's shadow is blocking the light from the sun.
Half of the moon is totally eclipsed.
O Half of the moon's surface that is illuminated by the sun is visible from Earth's perspective.
O It is a partial lunar eclipse.

Half of the moon's surface that is illuminated by the sun is visible from Earth's perspective.