Some scientists now claim that the low, wide debris-covered formations first observed on radar images of Mars as far back as the 1970s are in fact glaciers around 1km thick. The large formations were first seen on images sent back by NASAs Viking orbiters. There are many similar apron-shaped formations dotted all over the Martian landscape but the latest reconnaissance images from Mars have lead some scientists to believe that the bigger rounded slopes and ridges have features which suggest they were formed by a flow of thick ice-covered rubble. There are other known deposits of ice at the polar caps where temperatures are much lower. These newest discoveries are at much lower latitudes than those previously known about and some scientists believe that there could be enough water held in these formations to support humans in future Mars missions.

Question: NASA believes that there could be enough water on Mars to support human life.
Options:
A. true, B. false, C. uncertain
Answer: "C"