For the Moon to appear as a crescent shape to an observer, the
A) observer must be closer to the Sun than to the Moon.
B) observer must be on the opposite side of the Sun from the Moon.
C) Moon must be closer to the Sun than the observer is and somewhere between the Sun and the observer.
D) observer and the Moon must be at equal distances from the Sun.

Question

Quizplus · Accepted Answer

The crescent shape of the Moon is observed when the Moon is positioned between the Sun and the observer, but not directly in line. This positioning allows only a sliver of the Moon's surface to be illuminated by the Sun and visible from Earth, creating the crescent appearance.

For the Moon to Appear as a Crescent Shape to an Observer