What does Banquo advise Macbeth in reference to the prophecies after Macbeth is named Thane of Cawdor?
a) Banquo advises Macbeth to be cautious of the witches' prophecies.
b) Banquo encourages Macbeth to embrace his newfound power.
c) Banquo warns Macbeth not to trust the witches' predictions.
d) Banquo suggests Macbeth should seek further guidance from the witches.