【阅读理解】"Scientific conservatism suggests that a biological explanation should be the last choice after all non-biological explanations are addressed," Allen said. "We have a lot of work to do to rule out (排除……的可能性) possible non-biological explanations. It is more likely that a chemical process, without biology, can explain these results."
What can be inferred from what Allen said?
A
Scientists have different arguments over whether there is life on Titan.
B
Scientists all agree that there is life on Titan.
C
Scientists all suggest that a biological explanation is reasonable.
D
Scientists all agree that a non-biological chemical reaction is a possible explanation.
