In the book of Philemon, what underlying principles of Christian ethics and social reconciliation are exemplified by Paul's appeal on behalf of Onesimus, a runaway slave?

A Paul's primary concern is maintaining the existing social hierarchy and preserving Philemon's property rights. B Paul advocates for the complete abolition of slavery as a direct and immediate consequence of Christian faith. C Paul subtly encourages Philemon to receive Onesimus not merely as a slave, but as a brother in Christ, challenging the prevailing social norms and promoting reconciliation rooted in grace and mutual respect. D Paul's letter is primarily focused on establishing his own authority as an apostle and demanding Philemon's obedience.