It can be inferred from the passage that the author would be most likely to agree with which of the following statements? A. Whether conditions on Mars are conducive to human habitation is not the only issue that limits realistic consideration of terraforming. B. If we terraform Mars, it will be important to think about the long-term effects of changing a planet's climate. C. It is highly likely, according to recent data, that there is, or was at one time, life on Mars.