Question

A scientist publishes a paper that states that changes in the levels of gases in the atmosphere of a moon of Saturn indicate that there may be extraterrestrial life on that moon. Wifi statement correctly answers the question of an alien life on this moon is scientific?
A..The question is not scientific because it can not be tested without going to the moon of Saturn or sending a probe there.
B..The question is scientific because it deals with astronomy.
C..The question is not scientific because it involves alien.
D..The question is not scientific because it is testable and verifiable