Which of the Following Observations Indicates That Conditions on Mars

Which of the following observations indicates that conditions on Mars may have been suitable for life in the past?

A) There are very large extinct volcanoes on Mars.
B) There is a very deep and long canyon that extends across Mars.
C) There are dried-up riverbeds on Mars.
D) Mars has polar caps made of "dry ice."
E) Mars has two small moons.

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