Spacecraft Exploring the Moon in the 1990s Found Evidence of Water

Spacecraft exploring the Moon in the 1990s found evidence of water:

A) as hoar frost on the rims of craters, frozen out during lunar night but quickly evaporating when illuminated by sunlight.
B) in the depths of the sinuous rilles or valleys, probably the frozen remnants of the rivers that caused the valleys.
C) as ice in craters near the Moon's south pole.
D) as permafrost all over the Moon, particularly in the light-colored highlands.