Occultist: If there are ghosts, then they are supernatural beings. But science studies only natural phenomena. Ttherefore, there can be no scientific basis for criticizing the evidence that leads people to believe in ghosts. The occultist's argument is most vulnerable to criticism on the grounds that it takes for granted that ['other supernatural beings are not responsible for the evidence that leads people to believe in ghosts', 'people who believe in ghosts do so on the basis of evidence', 'the evidence that leads people to believe in ghosts cannot consist of natural phenomena', 'there are no methods for ascertaining the truth or falsity of any belief about the supernatural']