【单选题】Which of the following arguments is an ad hominem?
A.
It’s true that John blurted out in court that the defendant was guilty, but John wasn’t entitled to speak on that occasion, so you must ignore what he said.
B.
John said that the defendant was guilty, and John’s testimony is as reliable as anybody’s, so you should conclude that the defendant is guilty .
C.
John said that the defendant was guilty, and in fact the defendant is guilty, so John spoke the truth.
D.
John said that the defendant was guilty, and Jane said that too, so Jane corroborated John’s testimony.