In the book of Philemon, what is the central theological and ethical implication of Paul's appeal to Philemon regarding Onesimus, a formerly enslaved person?

A Paul was primarily concerned with maintaining the social hierarchy and avoiding any disruption to the Roman economy. B Paul was advocating for the abolishment of slavery throughout the Roman Empire through direct political action. C Paul was appealing for Philemon to forgive and accept Onesimus not merely as a slave, but as a brother in Christ, reflecting the transformative power of the Gospel to reconcile individuals and challenge social inequalities. D Paul was primarily seeking financial support from Philemon to further his missionary journeys.