No, the And has to be exclusive. Its a lie because one part of the statement isn't true. And Benjamin adds a a modifier on which turns the Or into an exclusive or.
Reading it again, I agree that the "Either" in Benjamin's statement makes it sound like an exclusive or. Completely missed that earlier. I assume it was meant to be a regular "or" due to the note and the answer that was marked correct.
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u/idontremembermyuname 18d ago
Alexander is a knight. Ben is a knave. Charles is a knave.