The passage from Ephesians 6:5-9 discusses the relationships between servants and their masters. It emphasizes obedience and service, addressing both servants and masters within the context of Christian teachings.
Given the options provided, the individual most likely to quote this passage would be:
A. a Southern slave owner
This is because the passage can be interpreted as endorsing the idea of obedience from servants (which could be applied to enslaved people) and responsibilities of masters, which could have been rationalized by Southern slave owners to justify their practices within a religious framework.