Scientists Recently Confirmed the Presence of Water Ice at the Poles

Scientists recently confirmed the presence of water ice at the poles of the Moon. Where did this water come from?

A) The ice is all that remains of the Moon's polar ice caps, present in the Moon's early history.
B) Water was deposited on the Moon by cometary impacts, and it condensed in deep polar craters.
C) Early lunar oceans evaporated quickly, and the water vapor condensed in deep polar craters.
D) The water is released as polar region crust stretches due to tidal forces from Earth.
E) None of these choices are correct.