We can see that the __________ evidence used by Charlie must be the the type of evidence that a charlatan (fraud) would use.

"Pithy" (concise and having substance) and "cogent" (clear, logical, convincing) are traps because they are associated with arguments, and thus with evidence, but they would not logically describe evidence, especially evidence that a charlatan would use.

"Substantiated" is another trap because it's associated with arguments and evidence but substantiated evidence would not be associated with fraud.

"Irreproachable" (beyond criticism) evidence is basically the opposite of the type of evidence a charlatan would use.

"Specious" (falsely appearing genuine) and "spurious" (false or fake) evidence are both types of evidence that a charlatan would use, and the two words produce sentences with similar meanings.

So, the correct answers are (A) and (F).