Concept:The word “duty” here means the loyalty that Laertes owes to the King.Explanation:Laertes says he came to Denmark willingly.The purpose of his visit was to honour Claudius at his coronation.That act of honour is shown by the word “duty”.It is not merely a paid job or an assigned task.It is a gesture of allegiance and respect towards the new king.After this act of loyalty is complete, he asks for permission to leave for France.Answer:C. loyalty