Concept:Paul wished to keep Onesimus because Onesimus was helpful to him while he was in prison.
Explanation:In his letter to Philemon, Paul clearly states that he would have liked to retain Onesimus with him.
The purpose was so that Onesimus could serve Paul during his imprisonment for the gospel.
Paul, however, did not want to force this arrangement without Philemon’s consent.
He respected Philemon’s authority over Onesimus as his master.
Therefore, Paul’s desire to keep Onesimus was based on the service Onesimus could render to him in prison.
Answer:D. to serve him during his imprisonment