In writing, what does the introduction set up?

The introduction in a piece of writing serves to establish the main argument or thesis. It is the initial portion where the author presents the topic and provides context, hooking the reader’s interest while outlining the purpose of the text. The introduction lays the groundwork for what will follow, guiding the reader's understanding of the main points that will be explored in the body of the work. By clearly stating the main argument early on, the introduction helps to frame the discussion and allows readers to know what to expect in the subsequent sections. This essential role in guiding the narrative or analysis is why the first choice is the correct answer.