Answer:
D. Macbeth killing the King
Step-by-step explanation:
Macbeth found out that King Duncan has made Malcolm the Prince of Cumberland and heir to the throne in Scotland, he felt he couldn't just sit back and watch events unfold, especially since it does not favor him. Fuelled by the witches' prophesy, he decided to give into his "black and deep desires" which is to commit murder.
Once he successfully gets Duncan out of the way, he will have the opportunity to carry out his ambitions and that of his wife.