Because the moon rotates once for each revolution around earth,
choose one answer.
a. you see some phases more than others.
b. a different side of the moon faces earth each day.
c. you never see the far side of the moon.

I am pretty sure that the correct answe for the question represented above is the last option from the scale. So, because the moon rotates once for each revolution you never see the far side of the moon. Of course all the options seem familiar, but that one is logically correct.