TOEFL Listening: TPO-TOEFL阅读TPO - J5FL53IP95EOIK17N$

According to paragraph 3, how is Callisto different from all other planet-sized objects in the solar system? A. It can form and retain impact craters on its icy surface. B. It has ice glaciers that do not flow or deform. C. It has never had the interior forces required for geological evolution. D. It is more than four billion years old.