In Macbeth, Duncan doesn't suspect that Lady Macbeth wishes him harm because Lady Macbeth only reveals her ambition and her desire to see Duncan murdered to her husband; she is kind to the king while he lives. Option C is correct.
Lady Macbeth is a leading character in William Shakespeare's tragedy Macbeth. She is the wife of the play's tragic hero, Macbeth who is described as a Scottish nobleman, Lady Macbeth urges her husband into committing regicide, after which she becomes queen of Scotland.