In the book of Philemon, what deeper principle of Christian reconciliation is Paul subtly advocating for through his appeal on behalf of Onesimus?

A The abolition of slavery as an economic system within the Roman Empire. B The importance of maintaining social hierarchies for the sake of order and stability. C The transformation of social relationships through forgiveness and treating all believers as equals in Christ, regardless of their social status. D The need for runaway slaves to be punished according to Roman law to deter future offenses.