Concept:The correct word must express the idea of forgiveness or pardon of sins.Explanation:The old man prays before death, so he is most likely seeking forgiveness for his sins.The word “remission” means forgiveness or the cancellation of sins.The other options do not fit the meaning of the sentence.“Omission” means leaving something out.“Commission” means the act of doing something, such as a crime.“Permission” means allowing or authorizing something.Therefore, the completed sentence is: “The old man prayed for the remission of his sins before he died.”Answer:D. remission