Final answer:
The argument that uses circular reasoning is option C: Anyone who agrees with my opponent is a witch.
Step-by-step explanation:
The argument that uses circular reasoning is option C: Anyone who agrees with my opponent is a witch. Circular reasoning occurs when the conclusion of an argument is assumed in one of the premises as a way to support that conclusion. In this case, the statement assumes that anyone who agrees with the opponent is a witch, which is the very thing that the argument is trying to prove.
Learn more about Circular reasoning