GRE Reading Comprehension: OG/PP2-GRE阅读OG/PP2 - 6414PK625G445TXFP

Which of the following, if true, would challenge the hypothesis presented in the passage concerning Enceladus and Saturn's E ring? A. Enceladus is not the only moon orbiting Saturn. B. Enceladus's lack of craters is not due to erasure by water. C. No impact has occurred on Enceladus in the past few tens of thousands of years.