Which of the following incidents in The Tragedy of Macbeth, Act V, is most clearly a harbinger of Macbeth's downfall? Explain your response.
a. the gentlewoman's remark about Lady Macbeth, "She has a light by her continually"
b. Macbeth's calling his servant a "lily-livered boy"
c. Macbeth's remark, "Throw physic to the dogs"
d. the messenger's remark, "I looked toward Birnam, and anon, methought, / The wood began to move"
d, Explanation: This answer shows an understanding that a harbinger is a "forerunner," or "something that comes before to signal something else." Choices a, b, and c do not show an understanding of the meaning of harbinger.