[求助]

amo

19 Riothamus, a fifth-century king of the Britons, was betrayed by an associate, fought bravely against the Goths but was defeated, and disappeared mysteriously. Riothamus' activities, and only those of Riothamus, match almost exactly those attributed to King arthur. Therefore, Riothamus must be the historical model of the lengendary King Arthur.
The arguement above requires at least one additional premise.
Which of the following could be such a required premise?
(B) The stories told about King Arthur are not strictly fictitious but are based on a historical person and historical events
(C) Riothamus' associates were the authors of the original legends about king Arthur.
为什么B是答案，而c却不是？

cranberry

如果亚瑟王的故事完全是虚构的，那么这个人物就不可能在实际史料中找到对应，文章的结论自然就被否定了，用取非的方式是很快捷的。