Final answer:
In Shakespeare's play 'Macbeth', the former Thane of Cawdor was a traitor, which led to his execution and the title being granted to Macbeth. The correct option is A.
Step-by-step explanation:
The former Thane of Cawdor was a traitor. This is evident from the Shakespearean play Macbeth, where King Duncan refers to the Thane of Cawdor's deceitful actions. The play repeatedly mentions the treason of the Thane of Cawdor, leading to his execution and the title being granted to Macbeth.
For instance, in the dialogue, "No more that thane of Cawdor shall deceive Our bosom interest: go pronounce his present death, And with his former title greet Macbeth," Duncan clearly states the reason for his decision regarding the former Thane of Cawdor. The correct option is A.