The book of Philemon addresses the complex issue of slavery. What is the primary appeal Paul makes to Philemon regarding Onesimus, the formerly enslaved person?

A Paul demands that Philemon grant Onesimus his immediate freedom and pay him back wages. B Paul encourages Philemon to treat Onesimus as a beloved brother in Christ, rather than as a mere slave. C Paul suggests that Philemon sell Onesimus to another Christian master who will treat him more kindly. D Paul outlines a legal framework for the gradual abolition of slavery within the early church.