Big Book crit reasoning doubt


Answer:B
Why is C wrong? If that is the case won’t that pretty much 99% confirm that Arthur is based on Riothamus? I know he was betrayed by an associate but in C it says associateS, not that specific associate that betrayed him.

How so? Please explain your reasoning.

Is it not obvious how? Or does associate mean something else? I thought it meant like the servant of Riothamus.

Not for me. Please explain the conclusion of the argument, the basis, the assumptions and how option C would weaken it.