Consider the three items that are not relevant to the giant impact hypothesis. the lack of volcanoes is a result of the moon’s relatively small size. but what explains the other two items — the moon’s synchronous rotation and gradually increasing distance from earth?
(a)-synchronous rotation is simply a coincidence, and this coincidence in turn causes the moon to move farther away with time.
(b)-both are results of tidal interactions between the moon and earth.
(c)-the giant impact would have caused the moon to rotate synchronously, and the outward fling from the impact would explain the increasing distance.
(d)-both are results of the moon’s small size.