The three groups that are in the story are the city group, the feudal group, and the pilgrims. Chaucer falls under the feudal group because he spent a lot of his time being a negotiator and diplomat for the government. He has some feudal responsibility since he is supported by the government.
The correct answer of the given question above would be the third option. What the main idea does not do is to show what a reader will learn, rather, it only shows what the story is about, summarizes the details and events, and illustrates an important idea. Hope this answers your question.
I think it is A: It makes clear to the reader that the narrator is making an ironic statement.
