In this excerpt from Mark Twain’s “How to Tell a Story,” which sentence is most clearly the thesis statement?

I think either:
1."The humorous story is American, the comic story is English, the witty story is French. "
or
2."The humorous story depends for its effect upon the manner of the telling; the comic story and the witty story upon the matter.”
Answer:
There are several kinds of stories, but only one difficult kind—the humorous.
Explanation: