Which technique is Jude most clearly using in the following discussion?

JUDE:
The author is talking about baseball players who have gone on strike over salary disputes. He claims they should be stripped of all their titles, even though the titles had been earned while they were playing under contract. Do you think he makes a strong case?

CARLY:
I never watch baseball, so I don't know too much about it.

JUDE:
That's O.K. We're not really talking about baseball. We're just talking about the author's ability to support his claim.
A. Using evidence
B. Confirming the question
C. Making an objective
D. Synthesizing ideas