Oscar: I have been accused of plagiarizing the work of Ethel Myers in my recent article. But that accusation is unwarranted. Although I admit I used passages from Myers’s book without attribution, Myers gave me permission in private correspondence to do so.

Millie: Myers cannot give you permission to plagiarize. Plagiarism is wrong, not only because it violates author’s rights to their own words, but also because it misleads readers: it is fundamentally a type of lie. A lie is no less a lie if another person agrees to the deception.

6. Millie uses which one of the following argumentative strategies in contesting Oscar’s position?

(A) analyzing plagiarism in a way that undermines Oscar’s position

(B) invoking evidence to show that Oscar did quote Myers’ work without attribution

(C) challenging Oscar’s ability to quote Myers’ work without attribution

(D) citing a theory of rights that prohibits plagiarism and suggesting that Oscar is committed to that theory

(E) showing that Oscar’s admission demonstrates his lack of credibility

我选的是D,答案选A，Why?