What do the three witches predict will happen to Macbeth?

A. He will become thane of Cawdor and king.

B. He will be unable to sleep and waste away until death.

C. He will slay Duncan and become king of Norway.

D. He will not be king, but his sons will become kings.

A, they predict he will be Thane of Cawdor and King of Scotland. In the scene they proclaim each prediction with an "All hail Macbeth ... " followed by the title. He is already Thane of Glamis, and due to the traitorous act of the Thane of Cawdor, Macbeth is granted this.