Sizable amounts of ice on the moon could provide future moon dwellers with drinking water and, if they split the water into its atomic components, hydrogen for fuel and oxygen for air. For a decade, scientists have argued about whether there is Ice in the Shaddeton crater located at the moon's south pole. Radar signals reflected off the crater are consistent with one of two scenarios: either the crater contains ice or the crater has a highly rough surface. Many scientists believe that the Shackleton crater does contain ice because_________.

Which of the following, if true, most logically completes the argument above?