The book of Philemon addresses the issue of slavery through the story of Onesimus, a runaway slave. What is the central appeal Paul makes to Philemon regarding Onesimus?

A Paul demands that Philemon immediately free all of his slaves as a sign of Christian faith. B Paul requests that Philemon punish Onesimus severely as a deterrent to other slaves. C Paul encourages Philemon to receive Onesimus back not as a slave, but as a beloved brother in Christ. D Paul offers to buy Onesimus from Philemon, providing financial compensation for the loss of property.