The Moon Lacks Life and Varies Dramatically in Temperature

The moon lacks life and varies dramatically in temperature. If we could keep a layer of water spread on the surface of the moon, what effect would it have?

A) The temperatures would drop to the lower extremes.
B) Physical conditions would remain the same.
C) Life would be possible, but it would have to withstand these extremes in temperature.
D) Water would absorb and hold heat and moderate the temperature extremes.
E) Because water has a high heat of vaporization, the temperatures would rise to the upper extremes.