What is the theological significance of the apostle Paul's appeal to Philemon regarding Onesimus, the runaway slave, in the context of Roman social structures?

A Paul affirms the institution of slavery as divinely ordained. B Paul primarily seeks financial compensation for Philemon's loss of property. C Paul implicitly challenges the hierarchical power dynamics of the Roman world by advocating for Onesimus's acceptance as a brother in Christ, hinting at the transformative power of the gospel to transcend social barriers. D Paul explicitly demands the immediate abolition of slavery throughout the Roman Empire.