In Act I, of "The Tragedy of Macbeth", by William Shakespeare, what Macbeth feels about Duncan's plans for his son is option C. Macbeth has "black and deep desires" regarding Duncan's son and heir, Malcolm. Macbeth has been told by the witches that he is to become King. He sees Malcolm as a threat and as a step on his way when King Duncan signals his son Malcolm as Prince of Cumberland. Macbeth doesn' t want the light to see his "black and deep desires".