Mars Has Sufficient Mass and a Low Enough Temperature That

Multiple Choice

Mars has sufficient mass and a low enough temperature that water molecules could exist in its atmosphere as vapour.Why does the atmosphere of Mars contain little or no water vapour?

A) Mars formed in a part of the solar nebula that lacked oxygen.
B) Mars formed in a part of the solar nebula that lacked hydrogen.
C) Ultraviolet radiation breaks water molecules into less massive particles that can escape.
D) Water molecules combine readily with chlorine to form hydrochloric acid.