Final answer:
Former Vice President Cheney believes that the use of harsh interrogation techniques is justifiable, linking this belief to national security and protection against terrorism, although the topic is controversial regarding its effectiveness and ethics.
Thus, the correct option is c.
Step-by-step explanation:
Former Vice President Cheney has argued that the use of harsh interrogation techniques is justifiable. This perspective is often linked to the debate around national security measures and the ethics of interrogation.
Cheney's stance is rooted in the belief that such techniques can prevent terrorist attacks and protect American lives, despite controversies surrounding the effectiveness and morality of these methods.
Therefore, the correct option is c) Justifiable