Final answer:
The fallacy shown when someone responds to an accusation by accusing the accuser of the same crime is called Tu Quoque, a type of ad hominem attack that points to the accuser's hypocrisy instead of addressing the argument. The correct option is A) Tu Quoque.
Step-by-step explanation:
The fallacy demonstrated by accusing someone who has accused you of the same crime in your defense is known as Tu Quoque. This kind of ad hominem attack occurs when a person attempts to discredit another's argument by pointing out their hypocrisy, rather than addressing the substance of the argument itself.
In the context of the provided example, by accusing the accuser of stabbing someone, the accused is not defending against the stabbing charge but instead trying to deflect the accusation by attacking the accuser. This does not logically dispute the initial charge and is an irrelevant response in terms of arguing guilt or innocence in the case of the accused's own actions.
Ad hominem and Tu Quoque fall under the category of fallacies of relevance, where the evidence or arguments brought up are not relevant to the issue being discussed. Instead of engaging with the actual argument, the individual launches an attack that does not logically contribute to the discussion at hand.