One Piece of Evidence Against the Possibility of Water on Mars

Multiple Choice

One piece of evidence against the possibility of water on Mars is:

A) the current lack of water on Mars.
B) the fact that the polar ice caps are made of carbon dioxide ice.
C) the volcanic activity on Mars.
D) the few carbonate rock layers that would have formed on the bottoms of oceans.
E) the "hydrated" chemical compounds found on surface rocks all over the planet.