Answer: A
Explanation: The only plausible answer to this is A, since they wouldn't refer to truth as Old boy, and there's nothing respectful abt this phrase, especially when addressing someone. It is also unlikely that they would refer this about witchcraft and spirits in a humorous way, as there's really nothing humorous about this subject that can be seen in this passage. Witchcraft and spirits are plural as well, which makes it even more clear that 'old boy' couldn't have been used to refer to them.