Answer: D. She is reliving the night that she and Macbeth killed King Duncan.
Explanation: The main idea of this passage from Act V, Scene I, of "The Tragedy of Macbeth" by William Shakespeare, is that Lady Macbeth is reliving the night that she and Macbeth killed King Duncan. The doctor is in Dunsinane to treat Lady Macbeth's new habit of sleepwalking. She enters the room with a candle and speaks about the night she and Macbeth killed King Duncan.