When the moon and the sun are both positioned on the same side of earth, the lighted face of the moon faces away from earth. the side of the moon that faces earth is totally dark. this phase of the moon is called a moon. a) crescent b) full c) new d) waxing

When the moon and the sun are both positioned together on the same side of the earth it is called a new moon.

This is time where there is a conjunction happening between the moon and the sun. At this time, the moon is not yet seen from the earth.

That is why it is said to be totally dark. In the field of astronomy, this state is referred to as the first lunar stage.

Read more on moon here:  link

When the Moon and the Sun are both positioned on the same side of Earth, the lighted face of the Moon faces away from Earth. The side of the Moon that faces Earth is totally dark. This phase of the Moon is called a New Moon. (C)

a is the answer i believe.