Concept:The phrase "would rather" is used to express preference when talking about what someone else should do.Explanation:After the subject "I," only "would" fits correctly with "rather" to form the fixed expression "would rather."The structure "would rather + subject + past tense" shows a preference about another person's action.So the complete sentence is: "I would rather he did not stay."This means the speaker prefers that he does not stay.Answer:D. would