Which one of the following statements is true？A．The moon which appears round at its bright

Which one of the following statements is true？

A．The moon which appears round at its brightest is called full moon.

B．The moon's diameter is exactly one fourth of that of the earth.

C．The light by which we see the old moon comes from the sun.

D．The part of the moon which is not lighted by the sun is completely dark.