Which event in Macbeth illustrates the recurring motif of "Fair is foul, and foul is fair"?
a. Macbeth kills the current king and is rewarded by being named king himself.
b. Lady Macbeth makes excuses for Macbeth when he acts crazy at the banquet.
c. Macbeth kills Duncan's guard in a fit of anger and then lies about his reasons.
d. Macduff travels to England to talk to Duncan's son, Malcolm.