Final answer:
Option C describes the scenario where Paul led a runaway slave to Christ and advised him to return to his Christian master, mirroring the story of Onesimus in the book of Philemon.
Step-by-step explanation:
The scenario in which Paul led a runaway slave to Christ and then sent the slave back to his Christian master is described by option C: Paul met a runaway slave, shared the Gospel, and then advised the slave to return to his Christian master, serving as an intermediary. This is a reference to the New Testament book of Philemon, where Paul writes to Philemon, a Christian and a slave owner, regarding Onesimus, a runaway slave. Paul had met Onesimus while in prison, converted him to Christianity, and sent him back to Philemon with a letter requesting that Philemon receive Onesimus as a brother in Christ, rather than merely a slave.